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<title>Checks if the object or class has a property</title>
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<h1 class="refname">property_exists</h1>
<p class="verinfo">(PHP 5 >= 5.1.0)</p><p class="refpurpose"><span class="refname">property_exists</span> — <span class="dc-title">
Checks if the object or class has a property
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.property-exists-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>property_exists</strong></span>
( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$class</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$property</code></span>
)</div>
<p class="para rdfs-comment">
This function checks if the given <em><code class="parameter">property</code></em> exists in
the specified class.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
As opposed with <span class="function"><a href="function.isset.html" class="function">isset()</a></span>,
<span class="function"><strong>property_exists()</strong></span> returns <strong><code>TRUE</code></strong> even if the property
has the value <strong><code>NULL</code></strong>.
</p>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.property-exists-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">class</code></em></span>
<dd>
<p class="para">
The class name or an object of the class to test for
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">property</code></em></span>
<dd>
<p class="para">
The name of the property
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.property-exists-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> if the property exists, <strong><code>FALSE</code></strong> if it doesn't exist or
<strong><code>NULL</code></strong> in case of an error.
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.property-exists-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">Using this function will use any registered
<a href="language.oop5.autoload.html" class="link">autoloaders</a> if the class is not already known.</p></p></blockquote>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
The <span class="function"><strong>property_exists()</strong></span> function cannot detect properties
that are magically accessible using the <a href="language.oop5.overloading.html#language.oop5.overloading.members" class="link"><em>__get</em></a>
magic method.
</p>
</p></blockquote>
</div>
<div class="refsect1 changelog" id="refsect1-function.property-exists-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.3.0</td>
<td>
This function checks the existence of a property independent of
accessibility.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.property-exists-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-5064">
<p><strong>Example #1 A <span class="function"><strong>property_exists()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">class </span><span style="color: #0000BB">myClass </span><span style="color: #007700">{<br /> public </span><span style="color: #0000BB">$mine</span><span style="color: #007700">;<br /> private </span><span style="color: #0000BB">$xpto</span><span style="color: #007700">;<br /> static protected </span><span style="color: #0000BB">$test</span><span style="color: #007700">;<br /><br /> static function </span><span style="color: #0000BB">test</span><span style="color: #007700">() {<br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">property_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'myClass'</span><span style="color: #007700">, </span><span style="color: #DD0000">'xpto'</span><span style="color: #007700">)); </span><span style="color: #FF8000">//true<br /> </span><span style="color: #007700">}<br />}<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">property_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'myClass'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mine'</span><span style="color: #007700">)); </span><span style="color: #FF8000">//true<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">property_exists</span><span style="color: #007700">(new </span><span style="color: #0000BB">myClass</span><span style="color: #007700">, </span><span style="color: #DD0000">'mine'</span><span style="color: #007700">)); </span><span style="color: #FF8000">//true<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">property_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'myClass'</span><span style="color: #007700">, </span><span style="color: #DD0000">'xpto'</span><span style="color: #007700">)); </span><span style="color: #FF8000">//true, as of PHP 5.3.0<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">property_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'myClass'</span><span style="color: #007700">, </span><span style="color: #DD0000">'bar'</span><span style="color: #007700">)); </span><span style="color: #FF8000">//false<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">property_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'myClass'</span><span style="color: #007700">, </span><span style="color: #DD0000">'test'</span><span style="color: #007700">)); </span><span style="color: #FF8000">//true, as of PHP 5.3.0<br /></span><span style="color: #0000BB">myClass</span><span style="color: #007700">::</span><span style="color: #0000BB">test</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.property-exists-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.method-exists.html" class="function" rel="rdfs-seeAlso">method_exists()</a> - Checks if the class method exists</span></li>
</ul>
</p>
</div>
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