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<h1>Authentication<a class="headerlink" href="#authentication" title="Permalink to this headline">¶</a></h1>
<p>CodeIgniter intentionally does not provide an internal authentication or authorization class. There are a number
of great third-party modules that provide these services, as well as resources in the community for writing
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<li>Modules that handle login and logout operations should trigger the <code class="docutils literal notranslate"><span class="pre">login</span></code> and <code class="docutils literal notranslate"><span class="pre">logout</span></code> Events when successful</li>
<li>Modules that define a “current user” should define the function <code class="docutils literal notranslate"><span class="pre">user_id()</span></code> to return the user’s unique identifier, or <code class="docutils literal notranslate"><span class="pre">null</span></code> for “no current user”</li>
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