<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.11 $ -->
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  <refentry id="function.array-unique">
   <refnamediv>
    <refname>array_unique</refname>
    <refpurpose>Removes duplicate values from an array</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>array</type><methodname>array_unique</methodname>
      <methodparam><type>array</type><parameter>array</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>array_unique</function> takes input
     <parameter>array</parameter> and returns a new array
     without duplicate values.
    </para>
    <para>
     Note that keys are preserved. <function>array_unique</function> sorts
     the values treated as string at first, then will keep the first key
     encountered for every value, and ignore all following keys. It does not
     mean that the key of the first related value from the unsorted
     <parameter>array</parameter> will be kept.
    </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.
     </simpara>
     <simpara>
      The first element will be used.
     </simpara>
    </note>
    <para>
     <example>
      <title><function>array_unique</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$input = array ("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique ($input);
print_r($result);
?>
]]>
      </programlisting>
      <para>
       This will output: 
      </para>
      <screen role="php">
<![CDATA[
Array
(
    [a] => green
    [0] => red
    [1] => blue
)
]]>
      </screen>
     </example>
    </para>
    <para>
     <example>
      <title><function>array_unique</function> and types</title>
      <programlisting role="php">
<![CDATA[
<?php
$input = array (4,"4","3",4,3,"3");
$result = array_unique ($input);
var_dump($result);
?>
]]>
      </programlisting>
      <para>
       This script will output:
      </para>
      <screen role="php">
<![CDATA[
array(2) {
  [0] => int(4)
  [2] => string(1) "3"
}
]]>
      </screen>
     </example>
    </para>
   </refsect1>
  </refentry>

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