mirror of
https://github.com/sigmasternchen/php-doc-en
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2f7966f92e
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@81901 c90b9560-bf6c-de11-be94-00142212c4b1
116 lines
2.9 KiB
XML
116 lines
2.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.4 $ -->
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<!-- splitted from ./en/functions/array.xml, last change in rev 1.2 -->
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<refentry id="function.array-unique">
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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>
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<title>Description</title>
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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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<function>array_unique</function> takes input
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<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) $elem2</literal>. In words:
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when the string representation is the same.
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<!-- TODO: example of it... -->
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</simpara>
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<simpara>
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The first element will be used.
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</simpara>
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</note>
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<warning>
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<simpara>
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This was broken in PHP 4.0.4!
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<!-- TODO: when exactly was this broken?... -->
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</simpara>
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</warning>
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<para>
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<example>
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<title><function>array_unique</function> example</title>
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<programlisting role="php">
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<![CDATA[
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$input = array ("a" => "green", "red", "b" => "green", "blue", "red");
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$result = array_unique ($input);
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print_r($result);
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]]>
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</programlisting>
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<para>
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This will output:
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<screen role="php">
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<![CDATA[
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Array
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(
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[b] => green
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[1] => blue
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[2] => red
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)
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]]>
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</screen>
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</para>
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</example>
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</para>
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<para>
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<example>
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<title><function>array_unique</function> and types</title>
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<programlisting role="php">
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<![CDATA[
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$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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</programlisting>
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<para>
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The printout of the program above will be (PHP 4.0.6):
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<screen role="php">
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<![CDATA[
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array(2) {
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[3]=>
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int(4)
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[4]=>
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int(3)
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}
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]]>
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</screen>
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</para>
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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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