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                <h1 id="cronjobs">Cronjobs<a class="headerlink" href="#cronjobs" title="Permanent link">#</a></h1>
<p>Cronjobs offer an easy way to execute actions periodically, like cleaning up the database.</p>
<div class="admonition warning">
<p class="admonition-title">The execution of cronjobs is not guaranteed but requires someone to access the page with JavaScript enabled.</p>
</div>
<p>This page focuses on the technical aspects of cronjobs, <a href="../../../package/pip/cronjob/">the cronjob package installation plugin page</a> covers how you can actually register a cronjob.</p>
<h2 id="example">Example<a class="headerlink" href="#example" title="Permanent link">#</a></h2>
<div class="highlight"><pre><span></span><code><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">namespace</span> <span class="nx">wcf\system\cronjob</span><span class="p">;</span>
<span class="k">use</span> <span class="nx">wcf\data\cronjob\Cronjob</span><span class="p">;</span>
<span class="k">use</span> <span class="nx">wcf\system\WCF</span><span class="p">;</span>

<span class="sd">/**</span>
<span class="sd"> * Updates the last activity timestamp in the user table.</span>
<span class="sd"> * </span>
<span class="sd"> * @author  Marcel Werk</span>
<span class="sd"> * @copyright   2001-2016 WoltLab GmbH</span>
<span class="sd"> * @license GNU Lesser General Public License &lt;http://opensource.org/licenses/lgpl-license.php&gt;</span>
<span class="sd"> * @package WoltLabSuite\Core\System\Cronjob</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">LastActivityCronjob</span> <span class="k">extends</span> <span class="nx">AbstractCronjob</span> <span class="p">{</span>
    <span class="sd">/**</span>
<span class="sd">     * @inheritDoc</span>
<span class="sd">     */</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">execute</span><span class="p">(</span><span class="nx">Cronjob</span> <span class="nv">$cronjob</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">parent</span><span class="o">::</span><span class="na">execute</span><span class="p">(</span><span class="nv">$cronjob</span><span class="p">);</span>

        <span class="nv">$sql</span> <span class="o">=</span> <span class="s2">&quot;UPDATE  wcf&quot;</span><span class="o">.</span><span class="nx">WCF_N</span><span class="o">.</span><span class="s2">&quot;_user user_table,</span>
<span class="s2">                wcf&quot;</span><span class="o">.</span><span class="nx">WCF_N</span><span class="o">.</span><span class="s2">&quot;_session session</span>
<span class="s2">            SET user_table.lastActivityTime = session.lastActivityTime</span>
<span class="s2">            WHERE   user_table.userID = session.userID</span>
<span class="s2">                AND session.userID &lt;&gt; 0&quot;</span><span class="p">;</span>
        <span class="nv">$statement</span> <span class="o">=</span> <span class="nx">WCF</span><span class="o">::</span><span class="na">getDB</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">prepareStatement</span><span class="p">(</span><span class="nv">$sql</span><span class="p">);</span>
        <span class="nv">$statement</span><span class="o">-&gt;</span><span class="na">execute</span><span class="p">();</span>
    <span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h2 id="icronjob-interface"><code>ICronjob</code> Interface<a class="headerlink" href="#icronjob-interface" title="Permanent link">#</a></h2>
<p>Every cronjob needs to implement the <code>wcf\system\cronjob\ICronjob</code> interface which requires the <code>execute(Cronjob $cronjob)</code> method to be implemented.
This method is called by <a href="https://github.com/WoltLab/WCF/blob/master/wcfsetup/install/files/lib/system/cronjob/CronjobScheduler.class.php">wcf\system\cronjob\CronjobScheduler</a> when executing the cronjobs.</p>
<p>In practice, however, you should extend the <code>AbstractCronjob</code> class and also call the <code>AbstractCronjob::execute()</code> method as it fires an event which makes cronjobs extendable by plugins (see <a href="../events/">event documentation</a>).</p>
<h2 id="executing-cronjobs-through-cli">Executing Cronjobs Through CLI<a class="headerlink" href="#executing-cronjobs-through-cli" title="Permanent link">#</a></h2>
<p>Cronjobs can be executed through the command-line interface (CLI):</p>
<div class="highlight"><pre><span></span><code>php /path/to/wcf/cli.php &lt;&lt; &#39;EOT&#39;
USERNAME
PASSWORD
cronjob execute
EOT
</code></pre></div>
                
                  
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