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                <h1 id="exceptions">Exceptions<a class="headerlink" href="#exceptions" title="Permanent link">#</a></h1>
<h2 id="spl-exceptions">SPL Exceptions<a class="headerlink" href="#spl-exceptions" title="Permanent link">#</a></h2>
<p>The <a href="https://secure.php.net/manual/en/book.spl.php">Standard PHP Library (SPL)</a> provides some <a href="https://secure.php.net/manual/en/spl.exceptions.php">exceptions</a> that should be used whenever possible.</p>
<h2 id="custom-exceptions">Custom Exceptions<a class="headerlink" href="#custom-exceptions" title="Permanent link">#</a></h2>
<div class="admonition warning">
<p class="admonition-title">Do not use <code>wcf\system\exception\SystemException</code> anymore, use specific exception classes!</p>
</div>
<p>The following table contains a list of custom exceptions that are commonly used.
All of the exceptions are found in the <code>wcf\system\exception</code> namespace.</p>
<table>
<thead>
<tr>
<th>Class name</th>
<th>(examples) when to use</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>IllegalLinkException</code></td>
<td>access to a page that belongs to a non-existing object, executing actions on specific non-existing objects (is shown as http 404 error to the user)</td>
</tr>
<tr>
<td><code>ImplementationException</code></td>
<td>a class does not implement an expected interface</td>
</tr>
<tr>
<td><code>InvalidObjectArgument</code></td>
<td><span class="label label-info">5.4+</span> API method support generic objects but specific implementation requires objects of specific (sub)class and different object is given</td>
</tr>
<tr>
<td><code>InvalidObjectTypeException</code></td>
<td>object type is not of an expected object type definition</td>
</tr>
<tr>
<td><code>InvalidSecurityTokenException</code></td>
<td>given security token does not match the security token of the active user's session</td>
</tr>
<tr>
<td><code>ParentClassException</code></td>
<td>a class does not extend an expected (parent) class</td>
</tr>
<tr>
<td><code>PermissionDeniedException</code></td>
<td>page access without permission, action execution without permission (is shown as http 403 error to the user)</td>
</tr>
<tr>
<td><code>UserInputException</code></td>
<td>user input does not pass validation</td>
</tr>
</tbody>
</table>
                
              
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