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                  <a href="https://github.com/WoltLab/docs.woltlab.com/edit/5.4/docs/php/exceptions.md" title="Edit this page" class="md-content__button md-icon">
                    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
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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>
<h2 id="sensitive-arguments-in-stack-traces">Sensitive Arguments in Stack Traces<a class="headerlink" href="#sensitive-arguments-in-stack-traces" title="Permanent link">#</a></h2>
<p>Sometimes sensitive values are passed as a function or method argument.
If the callee throws an Exception, these values will be part of the Exception’s stack trace and logged, unless the Exception is caught and ignored.</p>
<p>WoltLab Suite will automatically suppress the values of parameters named like they might contain sensitive values, namely arguments matching the regular expression <code>/(?:^(?:password|passphrase|secret)|(?:Password|Passphrase|Secret))/</code>.</p>
<p>If you need to suppress additional arguments from appearing in the stack trace, you can add the <code>\wcf\SensitiveArgument</code> attribute to such parameters.
Arguments are only supported as of PHP 8 and ignored as comments in lower PHP versions.
In PHP 7, such arguments will not be suppressed, but the code will continue to work.
Make sure to insert a linebreak between the attribute and the parameter name.</p>
<p>Example:</p>
<div class="titledCodeBox">
    <div class="codeBoxTitle"><code>wcfsetup/install/files/lib/data/user/User.class.php</code></div>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span></pre></div></td><td class="code"><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\data\user</span><span class="p">;</span>

<span class="c1">// …</span>

<span class="k">final</span> <span class="k">class</span> <span class="nc">User</span> <span class="k">extends</span> <span class="nx">DatabaseObject</span> <span class="k">implements</span> <span class="nx">IPopoverObject</span><span class="p">,</span> <span class="nx">IRouteController</span><span class="p">,</span> <span class="nx">IUserContent</span>
<span class="p">{</span>
    <span class="c1">// …</span>

    <span class="k">public</span> <span class="k">function</span> <span class="nf">checkPassword</span><span class="p">(</span>
        <span class="c1">#[\wcf\SensitiveArgument()]</span>
        <span class="nv">$password</span>
    <span class="p">)</span> <span class="p">{</span>
        <span class="c1">// …</span>
    <span class="p">}</span>

    <span class="c1">// …</span>
<span class="p">}</span>
</code></pre></div>
</td></tr></table>
</div>
                
                  
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