<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.11 $ -->
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  <refentry id="function.array-diff">
   <refnamediv>
    <refname>array_diff</refname>
    <refpurpose>Computes the difference of arrays</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>array</type><methodname>array_diff</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_diff</function> returns an array
     containing all the values of <parameter>array1</parameter>
     that are not present in any of the other arguments.
     Note that keys are preserved.
    </para>
    <para>
     <example>
      <title><function>array_diff</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);
?>
]]>
      </programlisting>
      <para>
       Multiple occurrences in $array1 are all treated the same way.
       This will output :
      </para>
      <screen>
<![CDATA[
Array
(
    [1] => blue
)
]]>
      </screen>
     </example>
    </para>
    <note>
     <simpara>
      Two elements are considered equal if and only if
      <literal>(string) $elem1 === (string) $elem2</literal>. In words:
      when the string representation is the same.
      <!-- TODO: example of it... -->
     </simpara>
    </note>
    <note>
     <simpara>
      Please note that this function only checks one dimension of a n-dimensional
      array. Of course you can check deeper dimensions by using
      <literal>array_diff($array1[0], $array2[0]);</literal>.
     </simpara>
    </note>
    <warning>
     <simpara>
      This was broken in PHP 4.0.4!
      <!-- TODO: when exactly was this broken?... -->
     </simpara>
    </warning>
    <para>
     See also <function>array_diff_assoc</function>,
     <function>array_intersect</function>, and
     <function>array_intersect_assoc</function>.
    </para>
   </refsect1>
  </refentry>

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