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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-intersect">
<refnamediv>
<refname>array_intersect</refname>
<refpurpose>Computes the intersection of arrays</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_intersect</methodname>
<methodparam><type>array</type><parameter>array1</parameter></methodparam>
<methodparam><type>array</type><parameter>array2</parameter></methodparam>
<methodparam choice="opt"><type>array</type><parameter> ...</parameter></methodparam>
</methodsynopsis>
<para>
<function>array_intersect</function> returns an array
containing all the values of <parameter>array1</parameter>
that are present in all the arguments.
Note that keys are preserved.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array1</parameter></term>
<listitem>
<para>
The array with master values to check.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>array2</parameter></term>
<listitem>
<para>
An array to compare values against.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
A variable list of arrays to compare.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an array containing all of the values in
<parameter>array1</parameter> whose values exist in all of the parameters.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_intersect</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
print_r($result);
?>
]]>
</programlisting>
&example.outputs;
<screen role="php">
<![CDATA[
Array
(
[a] => green
[0] => red
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<simpara>
Two elements are considered equal if and only if
<literal>(string) $elem1 === (string) $elem2</literal>. In words:
when the string representation is the same.
<!-- TODO: example of it... -->
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_intersect_assoc</function></member>
<member><function>array_diff</function></member>
<member><function>array_diff_assoc</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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