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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@147346 c90b9560-bf6c-de11-be94-00142212c4b1
125 lines
3.9 KiB
XML
125 lines
3.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.5 $ -->
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<!-- splitted from ./en/functions/array.xml, last change in rev 1.14 -->
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<refentry id="function.array-udiff">
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<refnamediv>
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<refname>array_udiff</refname>
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<refpurpose>Computes the difference of arrays by using a callback function for data comparison.</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_udiff</methodname>
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<methodparam><type>array</type><parameter>array1</parameter></methodparam>
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<methodparam><type>array</type><parameter>array2</parameter></methodparam>
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<methodparam choice="opt"><type>array</type><parameter> ...</parameter></methodparam>
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<methodparam><type>callback</type><parameter>data_compare_func</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_udiff</function> returns an array
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containing all the values of <parameter>array1</parameter>
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that are not present in any of the other arguments.
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Note that keys are preserved. For the comparison of the data
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<parameter>data_compare_func</parameter> is used.
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It must return an integer less than, equal
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to, or greater than zero if the first argument is considered to
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be respectively less than, equal to, or greater than the
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second. This is unlike <function>array_diff</function> which uses an
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internal function for comparing the data.
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</para>
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<para>
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<example>
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<title><function>array_udiff</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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class cr {
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var $priv_member;
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function cr($val) {
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$this->priv_member = $val;
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}
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function comp_func_cr($a, $b) {
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if ($a->priv_member === $b->priv_member) return 0;
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return ($a->priv_member > $b->priv_member)? 1:-1;
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}
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}
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$a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),);
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$b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),);
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$result = array_udiff($a, $b, array("cr", "comp_func_cr"));
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print_r($result);
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?>
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]]>
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</programlisting>
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<para>
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The result is:
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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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[0.5] => cr Object
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(
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[priv_member:private] => 12
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)
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[0] => cr Object
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(
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[priv_member:private] => 23
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)
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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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<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) $elem2</literal>. In words:
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when the string representation is the same.
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</simpara>
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</note>
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<note>
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<simpara>
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Please note that this function only checks one dimension of a n-dimensional
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array. Of course you can check deeper dimensions by using
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<literal>array_udiff($array1[0], $array2[0], "data_compare_func");</literal>.
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</simpara>
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</note>
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<para>
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See also
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<function>array_diff</function>,
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<function>array_diff_assoc</function>,
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<function>array_diff_uassoc</function>,
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<function>array_udiff_assoc</function>,
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<function>array_udiff_uassoc</function>,
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<function>array_intersect</function>,
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<function>array_intersect_assoc</function>,
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<function>array_uintersect</function>,
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<function>array_uintersect_assoc</function> and
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<function>array_uintersect_uassoc</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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