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137 lines
4.1 KiB
XML
Executable File
137 lines
4.1 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 9e0f03ac354d797d1d16c0fcc1663e5e170f2727 Maintainer: HonestQiao Status: ready -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-intersect-key">
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<refnamediv>
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<refname>array_intersect_key</refname>
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<refpurpose>使用键名比较计算数组的交集</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_intersect_key</methodname>
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<methodparam><type>array</type><parameter>array</parameter></methodparam>
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<methodparam rep="repeat"><type>array</type><parameter>arrays</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_intersect_key</function> 返回一个数组，该数组包含了所有出现在
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<parameter>array</parameter> 和其它参数数组中同时存在的键名的值。
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</para>
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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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要检查的数组，作为主值。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>arrays</parameter></term>
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<listitem>
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<para>
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要被对比的数组。
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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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返回一个关联数组，该数组包含了所有出现在
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<parameter>array</parameter> 和其它参数数组中同时存在的键名的值。
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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_intersect_key</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
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$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
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var_dump(array_intersect_key($array1, $array2));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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array(2) {
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["blue"]=>
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int(1)
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["green"]=>
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int(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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<para>
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上例中可以看到，只有 <literal>'blue'</literal>
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和 <literal>'green'</literal> 两个键名同时出现在两个数组中，因此被返回。另外注意
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<literal>'blue'</literal> 和 <literal>'green'</literal>
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的值在两个数组中是不同的。但因为只检查键名，因此还是匹配。返回的只是
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<parameter>array</parameter> 中的值。
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</para>
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<para>
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在 <literal>key => value</literal> 对中的两个键名仅在
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<literal>(string) $key1 === (string) $key2 </literal>
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时才被认为相等。换句话说，执行了严格的类型检查，因此字符串的表达形式必须相同。
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>array_diff</function></member>
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<member><function>array_udiff</function></member>
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<member><function>array_diff_assoc</function></member>
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<member><function>array_diff_uassoc</function></member>
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<member><function>array_udiff_assoc</function></member>
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<member><function>array_udiff_uassoc</function></member>
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<member><function>array_diff_key</function></member>
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<member><function>array_diff_ukey</function></member>
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<member><function>array_intersect</function></member>
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<member><function>array_intersect_assoc</function></member>
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<member><function>array_intersect_uassoc</function></member>
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<member><function>array_intersect_ukey</function></member>
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</simplelist>
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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:"~/.phpdoc/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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