method-exists.xml

<?xml version="1.0" encoding="utf-8"?>
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<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 <parameter>false</parameter>。
      </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;
  &note.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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