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100 lines
2.7 KiB
XML
100 lines
2.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 42bd1bfed391b287e55e47fed1b8f8d22a033ee0 Maintainer: daijie Status: ready -->
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<!-- CREDITS: Luffy, mowangjuanzi -->
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<refentry xml:id="function.enum-exists" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>enum_exists</refname>
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<refpurpose>检测是否定义对应的枚举</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>bool</type><methodname>enum_exists</methodname>
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<methodparam><type>string</type><parameter>enum</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>autoload</parameter><initializer>&true;</initializer></methodparam>
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</methodsynopsis>
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<para>
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本函数检测是否定义指定的<link linkend="language.enumerations">枚举</link>。
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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>enum</parameter></term>
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<listitem>
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<para>
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枚举的名称。名称的匹配不区分大小写。
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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>autoload</parameter></term>
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<listitem>
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<para>
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如果尚未加载，是否<link linkend="language.oop5.autoload">自动加载</link>。
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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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如果 <parameter>enum</parameter> 已定义，返回 &true;，否则就返回 &false;。
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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>enum_exists</function> 示例</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// 在使用之前检测枚举是否存在
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if (enum_exists(Suit::class)) {
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$myclass = Suit::Hearts;
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}
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?>
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]]>
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</programlisting>
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</example>
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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>function_exists</function></member>
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<member><function>class_exists</function></member>
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<member><function>interface_exists</function></member>
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<member><function>get_declared_classes</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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