php-doc-en/reference/classobj/functions/method-exists.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.method-exists" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>method_exists</refname>
  <refpurpose>Checks if the class method exists</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>method_exists</methodname>
   <methodparam><type>mixed</type><parameter>object</parameter></methodparam>
   <methodparam><type>string</type><parameter>method_name</parameter></methodparam>
  </methodsynopsis>
  <para>
   Checks if the class method exists in the given
   <parameter>object</parameter>.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>object</parameter></term>
     <listitem>
      <para>
       An object instance or a class name
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>method_name</parameter></term>
     <listitem>
      <para>
       The method name
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if the method given by <parameter>method_name</parameter>
   has been defined for the given <parameter>object</parameter>, &false; 
   otherwise.
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &note.uses-autoload;
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>method_exists</function> example</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>Static <function>method_exists</function> example</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="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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