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method-exists.xml
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158 lines (153 loc) · 3.73 KB
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 3d8c79ee5c0dfb8dcb1f1474eb844763b9bb6cde Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: mowangjuanzi, Luffy -->
<refentry xml:id="function.method-exists" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>method_exists</refname>
<refpurpose>检查类的方法是否存在</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>method_exists</methodname>
<methodparam><type class="union"><type>object</type><type>string</type></type><parameter>object_or_class</parameter></methodparam>
<methodparam><type>string</type><parameter>method</parameter></methodparam>
</methodsynopsis>
<para>
检查类的方法是否存在于指定的 <parameter>object_or_class</parameter> 中。
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>object_or_class</parameter></term>
<listitem>
<para>
对象示例或者类名
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>method</parameter></term>
<listitem>
<para>
方法名
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
如果 <parameter>method</parameter>
所指的方法在 <parameter>object_or_class</parameter>
所指的对象类中已定义，则返回 &true;，否则返回 &false;。
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>7.4.0</entry>
<entry>
针对继承的私有方法的类检查现在返回 &false;。
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>method_exists</function> 示例</title>
<programlisting role="php">
<![CDATA[
<?php
$directory = new Directory('.');
var_dump(method_exists($directory,'read'));
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
bool(true)
]]>
</screen>
</example>
<example>
<title>静态 <function>method_exists</function> 示例
</title>
<programlisting role="php">
<![CDATA[
<?php
var_dump(method_exists('Directory','read'));
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
bool(true)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.uses-autoload;
<note>
<simpara>
<function>method_exists</function> 函数无法检测使用
<link linkend="language.oop5.overloading.methods"><literal>__call</literal></link>
魔术方法访问的方法。
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>function_exists</function></member>
<member><function>is_callable</function></member>
<member><function>class_exists</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
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sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-local-ecat-files:nil
End:
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-->