EVOLUTION-NINJA
Edit File: trackback.html
<!DOCTYPE html> <!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> <!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Trackback Class — CodeIgniter 3.1.5 documentation</title> <link rel="shortcut icon" href="../_static/ci-icon.ico"/> <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> <link rel="top" title="CodeIgniter 3.1.5 documentation" href="../index.html"/> <link rel="up" title="Libraries" href="index.html"/> <link rel="next" title="Typography Class" href="typography.html"/> <link rel="prev" title="HTML Table Class" href="table.html"/> <script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script> </head> <body class="wy-body-for-nav" role="document"> <div id="nav"> <div id="nav_inner"> <div id="pulldown-menu" class="ciNav"> <ul> <li class="toctree-l1"><a class="reference internal" href="../general/welcome.html">Welcome to CodeIgniter</a><ul class="simple"> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul> <li class="toctree-l2"><a class="reference internal" href="../installation/downloads.html">Downloading CodeIgniter</a></li> <li class="toctree-l2"><a class="reference internal" href="../installation/index.html">Installation Instructions</a></li> <li class="toctree-l2"><a class="reference internal" href="../installation/upgrading.html">Upgrading From a Previous Version</a></li> <li class="toctree-l2"><a class="reference internal" href="../installation/troubleshooting.html">Troubleshooting</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul> <li class="toctree-l2"><a class="reference internal" href="../overview/getting_started.html">Getting Started</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/at_a_glance.html">CodeIgniter at a Glance</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/features.html">Supported Features</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/appflow.html">Application Flow Chart</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a><ul> <li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li> <li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li> <li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li> <li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul> <li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li> <li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul> <li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li> </ul> </li> </ul> <ul class="current"> <li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current"> <li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li> <li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li> <li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li> <li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li> <li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li> <li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li> <li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li> <li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li> <li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li> <li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li> <li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li> <li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li> <li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li> <li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li> <li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li> <li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li> <li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li> <li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li> <li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li> <li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li> <li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li> <li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li> <li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li> <li class="toctree-l2 current"><a class="current reference internal" href="">Trackback Class</a></li> <li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li> <li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li> <li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li> <li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li> <li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul> <li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul> <li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> </ul> </li> </ul> </div> </div> </div> <div id="nav2"> <a href="#" id="openToc"> <img src="data:image/jpeg;base64,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" title="Toggle Table of Contents" alt="Toggle Table of Contents" /> </a> </div> <div class="wy-grid-for-nav"> <nav data-toggle="wy-nav-shift" class="wy-nav-side"> <div class="wy-side-nav-search"> <a href="../index.html" class="fa fa-home"> CodeIgniter</a> <div role="search"> <form id="rtd-search-form" class="wy-form" action="../search.html" method="get"> <input type="text" name="q" placeholder="Search docs" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation"> <ul> <li class="toctree-l1"><a class="reference internal" href="../general/welcome.html">Welcome to CodeIgniter</a><ul class="simple"> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul> <li class="toctree-l2"><a class="reference internal" href="../installation/downloads.html">Downloading CodeIgniter</a></li> <li class="toctree-l2"><a class="reference internal" href="../installation/index.html">Installation Instructions</a></li> <li class="toctree-l2"><a class="reference internal" href="../installation/upgrading.html">Upgrading From a Previous Version</a></li> <li class="toctree-l2"><a class="reference internal" href="../installation/troubleshooting.html">Troubleshooting</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul> <li class="toctree-l2"><a class="reference internal" href="../overview/getting_started.html">Getting Started</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/at_a_glance.html">CodeIgniter at a Glance</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/features.html">Supported Features</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/appflow.html">Application Flow Chart</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li> <li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a><ul> <li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li> <li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li> <li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li> <li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul> <li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li> <li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul> <li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li> <li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li> </ul> </li> </ul> <ul class="current"> <li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current"> <li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li> <li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li> <li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li> <li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li> <li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li> <li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li> <li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li> <li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li> <li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li> <li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li> <li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li> <li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li> <li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li> <li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li> <li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li> <li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li> <li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li> <li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li> <li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li> <li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li> <li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li> <li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li> <li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li> <li class="toctree-l2 current"><a class="current reference internal" href="">Trackback Class</a></li> <li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li> <li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li> <li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li> <li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li> <li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li> <li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul> <li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li> <li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li> </ul> </li> </ul> <ul> <li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul> <li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> </ul> </li> </ul> </div> </nav> <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> <i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="../index.html">CodeIgniter</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="breadcrumbs navigation"> <ul class="wy-breadcrumbs"> <li><a href="../index.html">Docs</a> »</li> <li><a href="index.html">Libraries</a> »</li> <li>Trackback Class</li> <li class="wy-breadcrumbs-aside"> </li> <div style="float:right;margin-left:5px;" id="closeMe"> <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> </div> </ul> <hr/> </div> <div role="main" class="document"> <div class="section" id="trackback-class"> <h1>Trackback Class<a class="headerlink" href="#trackback-class" title="Permalink to this headline">¶</a></h1> <p>The Trackback Class provides functions that enable you to send and receive Trackback data.</p> <p>If you are not familiar with Trackbacks you’ll find more information <a class="reference external" href="http://en.wikipedia.org/wiki/Trackback">here</a>.</p> <div class="contents local topic" id="contents"> <ul class="simple"> <li><a class="reference internal" href="#using-the-trackback-class" id="id1">Using the Trackback Class</a><ul> <li><a class="reference internal" href="#initializing-the-class" id="id2">Initializing the Class</a></li> <li><a class="reference internal" href="#sending-trackbacks" id="id3">Sending Trackbacks</a></li> <li><a class="reference internal" href="#receiving-trackbacks" id="id4">Receiving Trackbacks</a></li> <li><a class="reference internal" href="#your-ping-url" id="id5">Your Ping URL</a></li> <li><a class="reference internal" href="#creating-a-trackback-table" id="id6">Creating a Trackback Table</a></li> <li><a class="reference internal" href="#processing-a-trackback" id="id7">Processing a Trackback</a><ul> <li><a class="reference internal" href="#notes" id="id8">Notes:</a></li> </ul> </li> </ul> </li> <li><a class="reference internal" href="#class-reference" id="id9">Class Reference</a></li> </ul> </div> <div class="custom-index container"></div><div class="section" id="using-the-trackback-class"> <h2><a class="toc-backref" href="#id1">Using the Trackback Class</a><a class="headerlink" href="#using-the-trackback-class" title="Permalink to this headline">¶</a></h2> <div class="section" id="initializing-the-class"> <h3><a class="toc-backref" href="#id2">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3> <p>Like most other classes in CodeIgniter, the Trackback class is initialized in your controller using the <tt class="docutils literal"><span class="pre">$this->load->library()</span></tt> method:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'trackback'</span><span class="p">);</span> </pre></div> </div> <p>Once loaded, the Trackback library object will be available using:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span> </pre></div> </div> </div> <div class="section" id="sending-trackbacks"> <h3><a class="toc-backref" href="#id3">Sending Trackbacks</a><a class="headerlink" href="#sending-trackbacks" title="Permalink to this headline">¶</a></h3> <p>A Trackback can be sent from any of your controller functions using code similar to this example:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'trackback'</span><span class="p">);</span> <span class="nv">$tb_data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> <span class="s1">'ping_url'</span> <span class="o">=></span> <span class="s1">'http://example.com/trackback/456'</span><span class="p">,</span> <span class="s1">'url'</span> <span class="o">=></span> <span class="s1">'http://www.my-example.com/blog/entry/123'</span><span class="p">,</span> <span class="s1">'title'</span> <span class="o">=></span> <span class="s1">'The Title of My Entry'</span><span class="p">,</span> <span class="s1">'excerpt'</span> <span class="o">=></span> <span class="s1">'The entry content.'</span><span class="p">,</span> <span class="s1">'blog_name'</span> <span class="o">=></span> <span class="s1">'My Blog Name'</span><span class="p">,</span> <span class="s1">'charset'</span> <span class="o">=></span> <span class="s1">'utf-8'</span> <span class="p">);</span> <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">send</span><span class="p">(</span><span class="nv">$tb_data</span><span class="p">))</span> <span class="p">{</span> <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span> <span class="k">echo</span> <span class="s1">'Trackback was sent!'</span><span class="p">;</span> <span class="p">}</span> </pre></div> </div> <p>Description of array data:</p> <ul class="simple"> <li><strong>ping_url</strong> - The URL of the site you are sending the Trackback to. You can send Trackbacks to multiple URLs by separating each URL with a comma.</li> <li><strong>url</strong> - The URL to YOUR site where the weblog entry can be seen.</li> <li><strong>title</strong> - The title of your weblog entry.</li> <li><strong>excerpt</strong> - The content of your weblog entry.</li> <li><strong>blog_name</strong> - The name of your weblog.</li> <li><strong>charset</strong> - The character encoding your weblog is written in. If omitted, UTF-8 will be used.</li> </ul> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The Trackback class will automatically send only the first 500 characters of your entry. It will also strip all HTML.</p> </div> <p>The Trackback sending method returns TRUE/FALSE (boolean) on success or failure. If it fails, you can retrieve the error message using:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> </pre></div> </div> </div> <div class="section" id="receiving-trackbacks"> <h3><a class="toc-backref" href="#id4">Receiving Trackbacks</a><a class="headerlink" href="#receiving-trackbacks" title="Permalink to this headline">¶</a></h3> <p>Before you can receive Trackbacks you must create a weblog. If you don’t have a blog yet there’s no point in continuing.</p> <p>Receiving Trackbacks is a little more complex than sending them, only because you will need a database table in which to store them, and you will need to validate the incoming trackback data. You are encouraged to implement a thorough validation process to guard against spam and duplicate data. You may also want to limit the number of Trackbacks you allow from a particular IP within a given span of time to further curtail spam. The process of receiving a Trackback is quite simple; the validation is what takes most of the effort.</p> </div> <div class="section" id="your-ping-url"> <h3><a class="toc-backref" href="#id5">Your Ping URL</a><a class="headerlink" href="#your-ping-url" title="Permalink to this headline">¶</a></h3> <p>In order to accept Trackbacks you must display a Trackback URL next to each one of your weblog entries. This will be the URL that people will use to send you Trackbacks (we will refer to this as your “Ping URL”).</p> <p>Your Ping URL must point to a controller function where your Trackback receiving code is located, and the URL must contain the ID number for each particular entry, so that when the Trackback is received you’ll be able to associate it with a particular entry.</p> <p>For example, if your controller class is called Trackback, and the receiving function is called receive, your Ping URLs will look something like this:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">http</span><span class="o">://</span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">trackback</span><span class="o">/</span><span class="nx">receive</span><span class="o">/</span><span class="nx">entry_id</span> </pre></div> </div> <p>Where entry_id represents the individual ID number for each of your entries.</p> </div> <div class="section" id="creating-a-trackback-table"> <h3><a class="toc-backref" href="#id6">Creating a Trackback Table</a><a class="headerlink" href="#creating-a-trackback-table" title="Permalink to this headline">¶</a></h3> <p>Before you can receive Trackbacks you must create a table in which to store them. Here is a basic prototype for such a table:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="nx">trackbacks</span> <span class="p">(</span> <span class="nx">tb_id</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="nx">auto_increment</span><span class="p">,</span> <span class="nx">entry_id</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="k">default</span> <span class="mi">0</span><span class="p">,</span> <span class="nx">url</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> <span class="nx">title</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> <span class="nx">excerpt</span> <span class="nx">text</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> <span class="nx">blog_name</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> <span class="nx">tb_date</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> <span class="nx">ip_address</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span> <span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="sb">`tb_id`</span> <span class="p">(</span><span class="sb">`tb_id`</span><span class="p">),</span> <span class="nx">KEY</span> <span class="sb">`entry_id`</span> <span class="p">(</span><span class="sb">`entry_id`</span><span class="p">)</span> <span class="p">);</span> </pre></div> </div> <p>The Trackback specification only requires four pieces of information to be sent in a Trackback (url, title, excerpt, blog_name), but to make the data more useful we’ve added a few more fields in the above table schema (date, IP address, etc.).</p> </div> <div class="section" id="processing-a-trackback"> <h3><a class="toc-backref" href="#id7">Processing a Trackback</a><a class="headerlink" href="#processing-a-trackback" title="Permalink to this headline">¶</a></h3> <p>Here is an example showing how you will receive and process a Trackback. The following code is intended for use within the controller function where you expect to receive Trackbacks.:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'trackback'</span><span class="p">);</span> <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">database</span><span class="p">();</span> <span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="o">==</span> <span class="k">FALSE</span><span class="p">)</span> <span class="p">{</span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">send_error</span><span class="p">(</span><span class="s1">'Unable to determine the entry ID'</span><span class="p">);</span> <span class="p">}</span> <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">receive</span><span class="p">())</span> <span class="p">{</span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">send_error</span><span class="p">(</span><span class="s1">'The Trackback did not contain valid data'</span><span class="p">);</span> <span class="p">}</span> <span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> <span class="s1">'tb_id'</span> <span class="o">=></span> <span class="s1">''</span><span class="p">,</span> <span class="s1">'entry_id'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">),</span> <span class="s1">'url'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">data</span><span class="p">(</span><span class="s1">'url'</span><span class="p">),</span> <span class="s1">'title'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">data</span><span class="p">(</span><span class="s1">'title'</span><span class="p">),</span> <span class="s1">'excerpt'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">data</span><span class="p">(</span><span class="s1">'excerpt'</span><span class="p">),</span> <span class="s1">'blog_name'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">data</span><span class="p">(</span><span class="s1">'blog_name'</span><span class="p">),</span> <span class="s1">'tb_date'</span> <span class="o">=></span> <span class="nb">time</span><span class="p">(),</span> <span class="s1">'ip_address'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">ip_address</span><span class="p">()</span> <span class="p">);</span> <span class="nv">$sql</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">insert_string</span><span class="p">(</span><span class="s1">'trackbacks'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="nv">$sql</span><span class="p">);</span> <span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">send_success</span><span class="p">();</span> </pre></div> </div> <div class="section" id="notes"> <h4><a class="toc-backref" href="#id8">Notes:</a><a class="headerlink" href="#notes" title="Permalink to this headline">¶</a></h4> <p>The entry ID number is expected in the third segment of your URL. This is based on the URI example we gave earlier:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">http</span><span class="o">://</span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">trackback</span><span class="o">/</span><span class="nx">receive</span><span class="o">/</span><span class="nx">entry_id</span> </pre></div> </div> <p>Notice the entry_id is in the third URI segment, which you can retrieve using:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span> </pre></div> </div> <p>In our Trackback receiving code above, if the third segment is missing, we will issue an error. Without a valid entry ID, there’s no reason to continue.</p> <p>The $this->trackback->receive() function is simply a validation function that looks at the incoming data and makes sure it contains the four pieces of data that are required (url, title, excerpt, blog_name). It returns TRUE on success and FALSE on failure. If it fails you will issue an error message.</p> <p>The incoming Trackback data can be retrieved using this function:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">data</span><span class="p">(</span><span class="s1">'item'</span><span class="p">)</span> </pre></div> </div> <p>Where item represents one of these four pieces of info: url, title, excerpt, or blog_name</p> <p>If the Trackback data is successfully received, you will issue a success message using:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">trackback</span><span class="o">-></span><span class="na">send_success</span><span class="p">();</span> </pre></div> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The above code contains no data validation, which you are encouraged to add.</p> </div> </div> </div> </div> <div class="section" id="class-reference"> <h2><a class="toc-backref" href="#id9">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2> <dl class="class"> <dt id="CI_Trackback"> <em class="property">class </em><tt class="descname">CI_Trackback</tt><a class="headerlink" href="#CI_Trackback" title="Permalink to this definition">¶</a></dt> <dd><dl class="attribute"> <dt> <tt class="descname">$data = array('url' => '', 'title' => '', 'excerpt' => '', 'blog_name' => '', 'charset' => '')</tt></dt> <dd><p>Trackback data array.</p> </dd></dl> <dl class="attribute"> <dt> <tt class="descname">$convert_ascii = TRUE</tt></dt> <dd><p>Whether to convert high ASCII and MS Word characters to HTML entities.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::send"> <tt class="descname">send</tt><big>(</big><em>$tb_data</em><big>)</big><a class="headerlink" href="#CI_Trackback::send" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$tb_data</strong> (<em>array</em>) – Trackback data</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> </td> </tr> </tbody> </table> <p>Send trackback.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::receive"> <tt class="descname">receive</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Trackback::receive" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> </tr> <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> </tr> </tbody> </table> <p>This method simply validates the incoming TB data, returning TRUE on success and FALSE on failure. If the data is valid it is set to the <tt class="docutils literal"><span class="pre">$this->data</span></tt> array so that it can be inserted into a database.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::send_error"> <tt class="descname">send_error</tt><big>(</big><span class="optional">[</span><em>$message = 'Incomplete information'</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Trackback::send_error" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$message</strong> (<em>string</em>) – Error message</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> </td> </tr> </tbody> </table> <p>Responses to a trackback request with an error message.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">This method will terminate script execution.</p> </div> </dd></dl> <dl class="method"> <dt id="CI_Trackback::send_success"> <tt class="descname">send_success</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Trackback::send_success" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td> </tr> </tbody> </table> <p>Responses to a trackback request with a success message.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">This method will terminate script execution.</p> </div> </dd></dl> <dl class="method"> <dt id="CI_Trackback::data"> <tt class="descname">data</tt><big>(</big><em>$item</em><big>)</big><a class="headerlink" href="#CI_Trackback::data" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$item</strong> (<em>string</em>) – Data key</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Data value or empty string if not found</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Returns a single item from the response data array.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::process"> <tt class="descname">process</tt><big>(</big><em>$url</em>, <em>$data</em><big>)</big><a class="headerlink" href="#CI_Trackback::process" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$url</strong> (<em>string</em>) – Target url</li> <li><strong>$data</strong> (<em>string</em>) – Raw POST data</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> </td> </tr> </tbody> </table> <p>Opens a socket connection and passes the data to the server, returning TRUE on success and FALSE on failure.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::extract_urls"> <tt class="descname">extract_urls</tt><big>(</big><em>$urls</em><big>)</big><a class="headerlink" href="#CI_Trackback::extract_urls" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$urls</strong> (<em>string</em>) – Comma-separated URL list</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Array of URLs</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p> </td> </tr> </tbody> </table> <p>This method lets multiple trackbacks to be sent. It takes a string of URLs (separated by comma or space) and puts each URL into an array.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::validate_url"> <tt class="descname">validate_url</tt><big>(</big><em>&$url</em><big>)</big><a class="headerlink" href="#CI_Trackback::validate_url" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$url</strong> (<em>string</em>) – Trackback URL</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> </td> </tr> </tbody> </table> <p>Simply adds the <em>http://</em> prefix it it’s not already present in the URL.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::get_id"> <tt class="descname">get_id</tt><big>(</big><em>$url</em><big>)</big><a class="headerlink" href="#CI_Trackback::get_id" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$url</strong> (<em>string</em>) – Trackback URL</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">URL ID or FALSE on failure</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Find and return a trackback URL’s ID or FALSE on failure.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::convert_xml"> <tt class="descname">convert_xml</tt><big>(</big><em>$str</em><big>)</big><a class="headerlink" href="#CI_Trackback::convert_xml" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$str</strong> (<em>string</em>) – Input string</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Converted string</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Converts reserved XML characters to entities.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::limit_characters"> <tt class="descname">limit_characters</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$n = 500</em><span class="optional">[</span>, <em>$end_char = '&#8230;'</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Trackback::limit_characters" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$str</strong> (<em>string</em>) – Input string</li> <li><strong>$n</strong> (<em>int</em>) – Max characters number</li> <li><strong>$end_char</strong> (<em>string</em>) – Character to put at end of string</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Shortened string</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Limits the string based on the character count. Will preserve complete words.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::convert_ascii"> <tt class="descname">convert_ascii</tt><big>(</big><em>$str</em><big>)</big><a class="headerlink" href="#CI_Trackback::convert_ascii" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$str</strong> (<em>string</em>) – Input string</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Converted string</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Converts high ASCII text and MS Word special characterss to HTML entities.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::set_error"> <tt class="descname">set_error</tt><big>(</big><em>$msg</em><big>)</big><a class="headerlink" href="#CI_Trackback::set_error" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$msg</strong> (<em>string</em>) – Error message</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p> </td> </tr> </tbody> </table> <p>Set an log an error message.</p> </dd></dl> <dl class="method"> <dt id="CI_Trackback::display_errors"> <tt class="descname">display_errors</tt><big>(</big><span class="optional">[</span><em>$open = '<p>'</em><span class="optional">[</span>, <em>$close = '</p>'</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Trackback::display_errors" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$open</strong> (<em>string</em>) – Open tag</li> <li><strong>$close</strong> (<em>string</em>) – Close tag</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">HTML formatted error messages</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Returns error messages formatted in HTML or an empty string if there are no errors.</p> </dd></dl> </dd></dl> </div> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="typography.html" class="btn btn-neutral float-right" title="Typography Class">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="table.html" class="btn btn-neutral" title="HTML Table Class"><span class="fa fa-arrow-circle-left"></span> Previous</a> </div> <hr/> <div role="contentinfo"> <p> © Copyright 2014 - 2017, British Columbia Institute of Technology. Last updated on Jun 19, 2017. </p> </div> Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. </footer> </div> </div> </section> </div> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT:'../', VERSION:'3.1.5', COLLAPSE_INDEX:false, FILE_SUFFIX:'.html', HAS_SOURCE: false }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/js/theme.js"></script> <script type="text/javascript"> jQuery(function () { SphinxRtdTheme.StickyNav.enable(); }); </script> </body> </html>