mirror of
https://github.com/sigmasternchen/php-doc-en
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885d702e25
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@249444 c90b9560-bf6c-de11-be94-00142212c4b1
129 lines
3 KiB
XML
129 lines
3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.17 $ -->
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<refentry xml:id="function.array-unique" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>array_unique</refname>
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<refpurpose>Removes duplicate values from an array</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>array</type><methodname>array_unique</methodname>
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<methodparam><type>array</type><parameter>array</parameter></methodparam>
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</methodsynopsis>
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<para>
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Takes an input <parameter>array</parameter> and returns a new array
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without duplicate values.
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</para>
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<para>
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Note that keys are preserved. <function>array_unique</function> sorts
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the values treated as string at first, then will keep the first key
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encountered for every value, and ignore all following keys. It does not
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mean that the key of the first related value from the unsorted
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<parameter>array</parameter> will be kept.
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</para>
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<note>
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<simpara>
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Two elements are considered equal if and only if
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<literal>(string) $elem1 === (string) $elem2</literal>. In words:
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when the string representation is the same.
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</simpara>
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<simpara>
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The first element will be used.
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</simpara>
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</note>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>array</parameter></term>
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<listitem>
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<para>
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The input array.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns the filtered array.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>array_unique</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$input = array("a" => "green", "red", "b" => "green", "blue", "red");
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$result = array_unique($input);
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print_r($result);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen role="php">
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<![CDATA[
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Array
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(
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[a] => green
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[0] => red
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[1] => blue
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)
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]]>
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</screen>
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</example>
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</para>
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<para>
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<example>
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<title><function>array_unique</function> and types</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$input = array(4, "4", "3", 4, 3, "3");
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$result = array_unique($input);
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var_dump($result);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen role="php">
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<![CDATA[
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array(2) {
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[0] => int(4)
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[2] => string(1) "3"
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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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</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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