archived-doc-pt-br/reference/classobj/functions/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>Verifica se o método da classe existe</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>
   Verifica se o método da classe existe no
   <parameter>object_or_class</parameter> fornecido.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>object_or_class</parameter></term>
     <listitem>
      <para>
       Uma instância de objeto ou um nome de classe
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>method</parameter></term>
     <listitem>
      <para>
       O nome do método
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Retorna &true; se método informado no parâmetro <parameter>method</parameter>
   foi definido para o <parameter>object_or_class</parameter> informado, &false;
   caso contrário.
  </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>
       As verificações de classe em relação aos métodos privados herdados agora retornam &false;.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Exemplo de <function>method_exists</function></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>Exemplo de <function>method_exists</function> com método estático</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>
    A função <function>method_exists</function> não pode detectar métodos
    que são magicamente acessíveis usando o
    método mágico
    <link linkend="language.oop5.overloading.methods"><literal>__call</literal></link>.
   </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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