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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.array-unique" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_unique</refname>
<refpurpose>Removes duplicate values from an array</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_unique</methodname>
<methodparam><type>array</type><parameter>array</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_STRING</constant></initializer></methodparam>
</methodsynopsis>
<para>
Takes an input <parameter>array</parameter> and returns a new array
without duplicate values.
</para>
<para>
Note that keys are preserved. If multiple elements compare equal under
the given <parameter>flags</parameter>, then the key and value of
the first equal element will be retained.
</para>
<note>
<simpara>
Two elements are considered equal if and only if
<literal>(string) $elem1 === (string) $elem2</literal> i.e.
when the string representation is the same, the first element will be used.
</simpara>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
The input array.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>flags</parameter></term>
<listitem>
<para>
The optional second parameter <parameter>flags</parameter>
may be used to modify the comparison behavior using these values:
</para>
<para>
Comparison type flags:
<itemizedlist>
<listitem>
<simpara><constant>SORT_REGULAR</constant> - compare items normally
(don't change types)</simpara>
</listitem>
<listitem>
<simpara><constant>SORT_NUMERIC</constant> - compare items numerically</simpara>
</listitem>
<listitem>
<simpara><constant>SORT_STRING</constant> - compare items as strings</simpara>
</listitem>
<listitem>
<simpara><constant>SORT_LOCALE_STRING</constant> - compare items as
strings, based on the current locale.
</simpara>
</listitem>
</itemizedlist>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the filtered array.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>7.2.0</entry>
<entry>
If <parameter>flags</parameter> is <constant>SORT_STRING</constant>,
formerly <parameter>array</parameter> has been copied and non-unique
elements have been removed (without packing the array afterwards), but
now a new array is built by adding the unique elements. This can result
in different numeric indexes.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<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>
&example.outputs;
<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>
&example.outputs;
<screen role="php">
<![CDATA[
array(2) {
[0] => int(4)
[2] => string(1) "3"
}
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<simpara>
Note that <function>array_unique</function> is not intended to
work on multi dimensional arrays.
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_count_values</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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