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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-flip">
<refnamediv>
<refname>array_flip</refname>
<refpurpose>Exchanges all keys with their associated values in an array</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_flip</methodname>
<methodparam><type>array</type><parameter>trans</parameter></methodparam>
</methodsynopsis>
<para>
<function>array_flip</function> returns an <type>array</type> in flip
order, i.e. keys from <parameter>trans</parameter> become values and values
from <parameter>trans</parameter> become keys.
</para>
<para>
Note that the values of <parameter>trans</parameter> need to be valid
keys, i.e. they need to be either <type>integer</type> or
<type>string</type>. A warning will be emitted if a value has the wrong
type, and the key/value pair in question <emphasis>will not be
flipped</emphasis>.
</para>
<para>
If a value has several occurrences, the latest key will be
used as its values, and all others will be lost.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>trans</parameter></term>
<listitem>
<para>
An array of key/value pairs to be flipped.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the flipped array on success and &null; on failure.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_flip</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$trans = array_flip($trans);
$original = strtr($str, $trans);
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title><function>array_flip</function> example : collision</title>
<programlisting role="php">
<![CDATA[
<?php
$trans = array("a" => 1, "b" => 1, "c" => 2);
$trans = array_flip($trans);
print_r($trans);
?>
]]>
</programlisting>
<para>
now <varname>$trans</varname> is:
</para>
<screen>
<![CDATA[
Array
(
[1] => b
[2] => c
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_values</function></member>
<member><function>array_keys</function></member>
<member><function>array_reverse</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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