Availability in `PHP 4.0`
<p>Finds out whether a variable is a boolean</p>
<div id="parameters" class="content-anchor"></div><h2>Parameters</h2>
<table>
<thead>
<tr>
<th>Parameter</th>
<th>Data type</th>
<th>Default value</th>
<th>Note</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>$var</code></td>
<td><code>mixed</code></td>
<td><em>not</em></td>
<td>The variable being evaluated.</td>
</tr>
</tbody>
</table>
<div id="return-values" class="content-anchor"></div><h2>Return values</h2>
<p><code>bool</code></p>
<p>true if var is a boolean,
false otherwise.</p>
<div id="other-resources" class="content-anchor"></div><h2>Other resources</h2>
<p><a href="https://www.php.net/manual/en/function.is-bool.php">Official is-bool documentation</a></p>

PHP function is_bool()

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Parameters

Return values

Other resources

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