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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.array-combine" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_combine</refname>
<refpurpose>Creates an array by using one array for keys and another for its values</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_combine</methodname>
<methodparam><type>array</type><parameter>keys</parameter></methodparam>
<methodparam><type>array</type><parameter>values</parameter></methodparam>
</methodsynopsis>
<para>
Creates an <type>array</type> by using the values from the
<parameter>keys</parameter> array as keys and the values from the
<parameter>values</parameter> array as the corresponding values.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>keys</parameter></term>
<listitem>
<para>
Array of keys to be used. Illegal values for key will be
converted to <type>string</type>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>values</parameter></term>
<listitem>
<para>
<type>Array</type> of values to be used
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the combined <type>array</type>.
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
As of PHP 8.0.0, a <classname>ValueError</classname> is thrown if the number of elements in
<parameter>keys</parameter> and <parameter>values</parameter> does not
match.
Prior to PHP 8.0.0, a <constant>E_WARNING</constant> was emitted instead.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
<function>array_combine</function> will now throw a
<classname>ValueError</classname> if the number of elements
for each array is not equal;
previously this function returned &false; instead.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>A simple <function>array_combine</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);
print_r($c);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[green] => avocado
[red] => apple
[yellow] => banana
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_merge</function></member>
<member><function>array_walk</function></member>
<member><function>array_values</function></member>
<member><function>array_map</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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