mirror of
https://github.com/php/doc-zh.git
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29f99009b7
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@95662 c90b9560-bf6c-de11-be94-00142212c4b1
138 lines
3.4 KiB
XML
Executable File
138 lines
3.4 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.1 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.5 Maintainer: dallas Status: ready -->
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<refentry id="function.in-array">
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<refnamediv>
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<refname>in_array</refname>
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<refpurpose>如果数组中存在该值则返回 &true;</refpurpose>
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</refnamediv>
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<refsect1>
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<title>说明</title>
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<methodsynopsis>
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<type>bool</type><methodname>in_array</methodname>
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<methodparam><type>mixed</type><parameter>needle</parameter></methodparam>
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<methodparam><type>array</type><parameter>haystack</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>strict</parameter></methodparam>
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</methodsynopsis>
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<para>
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在 <parameter>haystack</parameter> 中搜索
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<parameter>needle</parameter>，如果找到则返回 &true;，否则返回 &false;。
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</para>
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<para>
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如果第三个参数 <parameter>strict</parameter> 的值为
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&true; 则 <function>in_array</function> 函数还会检查
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<parameter>needle</parameter> 的<link linkend="language.types">类型</link>是否和
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<parameter>haystack</parameter> 中的相同。
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</para>
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<note>
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<para>
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如果 <parameter>needle</parameter> 是字符串，则比较是区分大小写的。
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</para>
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</note>
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<note>
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<para>
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在 PHP 版本 4.2.0 之前，<parameter>needle</parameter> 不允许是一个数组。
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</para>
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</note>
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<para>
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<example>
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<title><function>in_array</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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$os = array ("Mac", "NT", "Irix", "Linux");
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if (in_array ("Irix", $os)) {
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print "Got Irix";
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}
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if (in_array ("mac", $os)) {
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print "Got mac";
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}
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]]>
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</programlisting>
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<para>
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第二个条件失败，因为 <function>in_array</function>
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是区分大小写的，所以以上程序显示为：
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<screen role="php">
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<![CDATA[
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Got Irix
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]]>
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</screen>
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</para>
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</example>
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</para>
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<para>
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<example>
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<title><function>in_array</function> 严格类型检查例子</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$a = array('1.10', 12.4, 1.13);
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if (in_array('12.4', $a, TRUE))
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echo "'12.4' found with strict check\n";
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if (in_array(1.13, $a, TRUE))
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echo "1.13 found with strict check\n";
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?>
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]]>
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</programlisting>
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<para>
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将显示：
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<screen role="php">
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<![CDATA[
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1.13 found with strict check
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]]>
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</screen>
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</para>
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</example>
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</para>
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<para>
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<example>
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<title><function>in_array</function> 中用数组作为 needle</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$a = array(array('p', 'h'), array('p', 'r'), 'o');
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if (in_array(array ('p', 'h'), $a))
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echo "'ph' was found\n";
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if (in_array(array ('f', 'i'), $a))
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echo "'fi' was found\n";
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if (in_array('o', $a))
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echo "'o' was found\n";
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?>
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// This will output:
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'ph' was found
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'o' was found
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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参见 <function>array_search</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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