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  <div class="section" id="upgrading-from-1-7-2-to-2-0-0">
<h1>Upgrading from 1.7.2 to 2.0.0<a class="headerlink" href="#upgrading-from-1-7-2-to-2-0-0" title="Permalink to this headline">¶</a></h1>
<p>Before performing an update you should take your site offline by
replacing the index.php file with a static one.</p>
<div class="section" id="update-instructions">
<h2>Update Instructions<a class="headerlink" href="#update-instructions" title="Permalink to this headline">¶</a></h2>
<div class="section" id="step-1-update-your-codeigniter-files">
<h3>Step 1: Update your CodeIgniter files<a class="headerlink" href="#step-1-update-your-codeigniter-files" title="Permalink to this headline">¶</a></h3>
<p>Replace all files and directories in your &#8220;system&#8221; folder <strong>except</strong>
your application folder.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you have any custom developed files in these folders please
make copies of them first.</p>
</div>
</div>
<div class="section" id="step-2-adjust-get-dir-file-info-where-necessary">
<h3>Step 2: Adjust get_dir_file_info() where necessary<a class="headerlink" href="#step-2-adjust-get-dir-file-info-where-necessary" title="Permalink to this headline">¶</a></h3>
<p>Version 2.0.0 brings a non-backwards compatible change to
get_dir_file_info() in the <a class="reference internal" href="../helpers/file_helper.html"><em>File
Helper</em></a>. Non-backwards compatible changes
are extremely rare in CodeIgniter, but this one we feel was warranted
due to how easy it was to create serious server performance issues. If
you <em>need</em> recursiveness where you are using this helper function,
change such instances, setting the second parameter, $top_level_only
to FALSE:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">get_dir_file_info</span><span class="p">(</span><span class="s1">&#39;/path/to/directory&#39;</span><span class="p">,</span> <span class="k">FALSE</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="step-3-convert-your-plugins-to-helpers">
<h3>Step 3: Convert your Plugins to Helpers<a class="headerlink" href="#step-3-convert-your-plugins-to-helpers" title="Permalink to this headline">¶</a></h3>
<p>2.0.0 gets rid of the &#8220;Plugin&#8221; system as their functionality was
identical to Helpers, but non-extensible. You will need to rename your
plugin files from filename_pi.php to filename_helper.php, move them to
your helpers folder, and change all instances of:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">plugin</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>to</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="step-4-update-stored-encrypted-data">
<h3>Step 4: Update stored encrypted data<a class="headerlink" href="#step-4-update-stored-encrypted-data" title="Permalink to this headline">¶</a></h3>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If your application does not use the Encrypt library, does
not store Encrypted data permanently, or is on an environment that does
not support Mcrypt, you may skip this step.</p>
</div>
<p>The Encrypt library has had a number of improvements, some for
encryption strength and some for performance, that has an unavoidable
consequence of making it no longer possible to decode encrypted data
produced by the original version of this library. To help with the
transition, a new method has been added, encode_from_legacy() that
will decode the data with the original algorithm and return a re-encoded
string using the improved methods. This will enable you to easily
replace stale encrypted data with fresh in your applications, either on
the fly or en masse.</p>
<p>Please read <a class="reference internal" href="../libraries/encrypt.html"><em>how to use this
method</em></a> in the Encrypt library
documentation.</p>
</div>
<div class="section" id="step-5-remove-loading-calls-for-the-compatibility-helper">
<h3>Step 5: Remove loading calls for the compatibility helper.<a class="headerlink" href="#step-5-remove-loading-calls-for-the-compatibility-helper" title="Permalink to this headline">¶</a></h3>
<p>The compatibility helper has been removed from the CodeIgniter core. All
methods in it should be natively available in supported PHP versions.</p>
</div>
<div class="section" id="step-6-update-class-extension">
<h3>Step 6: Update Class extension<a class="headerlink" href="#step-6-update-class-extension" title="Permalink to this headline">¶</a></h3>
<p>All core classes are now prefixed with CI_. Update Models and
Controllers to extend CI_Model and CI_Controller, respectively.</p>
</div>
<div class="section" id="step-7-update-parent-constructor-calls">
<h3>Step 7: Update Parent Constructor calls<a class="headerlink" href="#step-7-update-parent-constructor-calls" title="Permalink to this headline">¶</a></h3>
<p>All native CodeIgniter classes now use the PHP 5 __construct()
convention. Please update extended libraries to call
parent::__construct().</p>
</div>
<div class="section" id="step-8-move-any-core-extensions-to-application-core">
<h3>Step 8: Move any core extensions to application/core<a class="headerlink" href="#step-8-move-any-core-extensions-to-application-core" title="Permalink to this headline">¶</a></h3>
<p>Any extensions to core classes (e.g. MY_Controller.php) in your
application/libraries folder must be moved to the new
application/core folder.</p>
</div>
<div class="section" id="step-9-update-your-user-guide">
<h3>Step 9: Update your user guide<a class="headerlink" href="#step-9-update-your-user-guide" title="Permalink to this headline">¶</a></h3>
<p>Please replace your local copy of the user guide with the new version,
including the image files.</p>
</div>
</div>
<div class="section" id="update-notes">
<h2>Update Notes<a class="headerlink" href="#update-notes" title="Permalink to this headline">¶</a></h2>
<p>Please refer to the <a class="reference internal" href="../changelog.html#changelog"><em>2.0.0 Change Log</em></a> for full
details, but here are some of the larger changes that are more likely to
impact your code:</p>
<ul class="simple">
<li>Scaffolding has been removed.</li>
<li>The CAPTCHA plugin in now a <a class="reference internal" href="../helpers/captcha_helper.html"><em>helper</em></a>.</li>
<li>The JavaScript calendar plugin was removed.</li>
<li>The <em>system/cache</em> and <em>system/logs</em> directories are now in the application
directory.</li>
<li>The Validation class has been removed.  Please see the
<a class="reference internal" href="../libraries/form_validation.html"><em>Form Validation library</em></a></li>
<li>&#8220;default&#8221; is now a reserved name.</li>
<li>The xss_clean() function has moved to the <a class="reference internal" href="../libraries/security.html"><em>Security Class</em></a>.</li>
<li>do_xss_clean() now returns FALSE if the uploaded file fails XSS checks.</li>
<li>The <a class="reference internal" href="../libraries/sessions.html"><em>Session Class</em></a> requires now the use of an
encryption key set in the config file.</li>
<li>The following deprecated Active Record functions have been removed:
<tt class="docutils literal"><span class="pre">orwhere</span></tt>, <tt class="docutils literal"><span class="pre">orlike</span></tt>, <tt class="docutils literal"><span class="pre">groupby</span></tt>, <tt class="docutils literal"><span class="pre">orhaving</span></tt>, <tt class="docutils literal"><span class="pre">orderby</span></tt>,
<tt class="docutils literal"><span class="pre">getwhere</span></tt>.</li>
<li><tt class="docutils literal"><span class="pre">_drop_database()</span></tt> and <tt class="docutils literal"><span class="pre">_create_database()</span></tt> functions have been removed
from the db utility drivers.</li>
<li>The <tt class="docutils literal"><span class="pre">dohash()</span></tt> function of the <a class="reference internal" href="../helpers/security_helper.html"><em>Security helper</em></a>
has been renamed to <tt class="docutils literal"><span class="pre">do_hash()</span></tt> for naming consistency.</li>
</ul>
<div class="section" id="the-config-folder">
<h3>The config folder<a class="headerlink" href="#the-config-folder" title="Permalink to this headline">¶</a></h3>
<p>The following files have been changed:</p>
<ul class="simple">
<li>config.php</li>
<li>database.php</li>
<li>mimes.php</li>
<li>routes.php</li>
<li>user_agents.php</li>
</ul>
<p>The following files have been added:</p>
<ul class="simple">
<li>foreign_chars.php</li>
<li>profiler.php</li>
</ul>
</div>
</div>
</div>

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