<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Computes the intersection of arrays</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.array-intersect-ukey.html">array_intersect_ukey</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.array-key-exists.html">array_key_exists</a></div>
<div class="up"><a href="ref.array.html">Array Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="function.array-intersect" class="refentry">
<div class="refnamediv">
<h1 class="refname">array_intersect</h1>
<p class="verinfo">(PHP 4 >= 4.0.1, PHP 5)</p><p class="refpurpose"><span class="refname">array_intersect</span> — <span class="dc-title">Computes the intersection of arrays</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.array-intersect-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>array_intersect</strong></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array1</code></span>
, <span class="methodparam"><span class="type">array</span> <code class="parameter">$array2</code></span>
[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$...</code></span>
] )</div>
<p class="para rdfs-comment">
<span class="function"><strong>array_intersect()</strong></span> returns an array
containing all the values of <em><code class="parameter">array1</code></em>
that are present in all the arguments.
Note that keys are preserved.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.array-intersect-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">array1</code></em></span>
<dd>
<p class="para">
The array with master values to check.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">array2</code></em></span>
<dd>
<p class="para">
An array to compare values against.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">...</code></em></span>
<dd>
<p class="para">
A variable list of arrays to compare.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.array-intersect-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns an array containing all of the values in
<em><code class="parameter">array1</code></em> whose values exist in all of the parameters.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.array-intersect-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-4953">
<p><strong>Example #1 <span class="function"><strong>array_intersect()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$array1 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_intersect</span><span style="color: #007700">(</span><span style="color: #0000BB">$array1</span><span style="color: #007700">, </span><span style="color: #0000BB">$array2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Array
(
[a] => green
[0] => red
)
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.array-intersect-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>:
<span class="simpara">
Two elements are considered equal if and only if
<em>(string) $elem1 === (string) $elem2</em>. In words:
when the string representation is the same.
</span>
</p></blockquote>
</div>
<div class="refsect1 seealso" id="refsect1-function.array-intersect-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.array-intersect-assoc.html" class="function" rel="rdfs-seeAlso">array_intersect_assoc()</a> - Computes the intersection of arrays with additional index check</span></li>
<li class="member"> <span class="function"><a href="function.array-diff.html" class="function" rel="rdfs-seeAlso">array_diff()</a> - Computes the difference of arrays</span></li>
<li class="member"> <span class="function"><a href="function.array-diff-assoc.html" class="function" rel="rdfs-seeAlso">array_diff_assoc()</a> - Computes the difference of arrays with additional index check</span></li>
</ul>
</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.array-intersect-ukey.html">array_intersect_ukey</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.array-key-exists.html">array_key_exists</a></div>
<div class="up"><a href="ref.array.html">Array Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
