mirror of
https://github.com/sigmasternchen/php-doc-en
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23396d4d4e
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@138081 c90b9560-bf6c-de11-be94-00142212c4b1
96 lines
2.3 KiB
XML
96 lines
2.3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.8 $ -->
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<!-- splitted from ./en/functions/array.xml, last change in rev 1.2 -->
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<refentry id="function.array-keys">
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<refnamediv>
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<refname>array_keys</refname>
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<refpurpose>Return all the keys of an array</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>array</type><methodname>array_keys</methodname>
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<methodparam><type>array</type><parameter>input</parameter></methodparam>
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<methodparam choice="opt"><type>mixed</type><parameter>
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search_value
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</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_keys</function> returns the keys, numeric and
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string, from the <parameter>input</parameter> array.
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</para>
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<para>
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If the optional <parameter>search_value</parameter> is specified,
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then only the keys for that value are returned. Otherwise, all
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the keys from the <parameter>input</parameter> are returned.
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</para>
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<para>
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<example>
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<title><function>array_keys</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$array = array(0 => 100, "color" => "red");
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print_r(array_keys($array));
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$array = array("blue", "red", "green", "blue", "blue");
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print_r(array_keys($array, "blue"));
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$array = array("color" => array("blue", "red", "green"),
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"size" => array("small", "medium", "large"));
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print_r(array_keys($array));
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?>
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]]>
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</programlisting>
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<para>
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The printout of the program above will be:
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</para>
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<screen>
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<![CDATA[
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Array
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(
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[0] => 0
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[1] => color
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)
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Array
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(
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[0] => 0
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[1] => 3
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[2] => 4
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)
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Array
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(
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[0] => color
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[1] => size
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)
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]]>
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</screen>
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</example>
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</para>
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<para>
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See also <function>array_values</function> and
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<function>array_key_exists</function>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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