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<refentry xml:id="function.array-keys" xmlns="http://docbook.org/ns/docbook">

<refnamediv>

<refname>array_keys</refname>

<refpurpose>Retourne toutes les clés ou un ensemble des clés d'un tableau</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis role="procedural">

<type>array</type><methodname>array_keys</methodname>

<methodparam><type>array</type><parameter>array</parameter></methodparam>

</methodsynopsis>

<methodsynopsis role="procedural">

<type>array</type><methodname>array_keys</methodname>

<methodparam><type>array</type><parameter>array</parameter></methodparam>

<methodparam><type>mixed</type><parameter>filter_value</parameter></methodparam>

<methodparam choice="opt"><type>bool</type><parameter>strict</parameter><initializer>&false;</initializer></methodparam>

</methodsynopsis>

<para>

<function>array_keys</function> retourne les clés numériques

et littérales du tableau <parameter>array</parameter>.

</para>

<para>

Si une valeur de recherche <parameter>filter_value</parameter> est spécifiée,

seules les clés ayant cette valeur seront retournées.

Sinon, toutes les clés de <parameter>array</parameter> sont

retournées.

</para>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>array</parameter></term>

<listitem>

<para>

Un tableau contenant les clés à retourner.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><parameter>filter_value</parameter></term>

<listitem>

<para>

Si spécifié, alors seules les clés contenant cette valeur seront

retournées.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><parameter>strict</parameter></term>

<listitem>

<para>

Le paramètre <parameter>strict</parameter> force la comparaison

en mode strict, incluant le type, avec l'opérateur ===.

</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

Retourne un tableau de toutes les clés dans <parameter>array</parameter>.

</para>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<para>

<example>

<title>Exemple avec <function>array_keys</function></title>

<programlisting role="php">

<![CDATA[

<?php

$array = array(0 => 100, "color" => "red");

print_r(array_keys($array));

$array = array("blue", "red", "green", "blue", "blue");

print_r(array_keys($array, "blue"));

$array = array("color" => array("blue", "red", "green"),

"size" => array("small", "medium", "large"));

print_r(array_keys($array));

?>

]]>

</programlisting>

&example.outputs;

<screen>

<![CDATA[

Array

(

[0] => 0

[1] => color

)

Array

(

[0] => 0

[1] => 3

[2] => 4

)

Array

(

[0] => color

[1] => size

)

]]>

</screen>

</example>

</para>

</refsect1>

<refsect1 role="seealso">

&reftitle.seealso;

<para>

<simplelist>

<member><function>array_values</function></member>

<member><function>array_combine</function></member>

<member><function>array_key_exists</function></member>

<member><function>array_search</function></member>

</simplelist>

</para>

</refsect1>

</refentry>

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