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>method_exists</H1
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><P
>    (PHP 4, PHP 5)</P
>method_exists&nbsp;--&nbsp;检查类的方法是否存在</DIV
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NAME="AEN17151"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>method_exists</B
> ( object object, string method_name )<BR
></BR
><P
>&#13;   如果 <CODE
CLASS="parameter"
>method_name</CODE
>
   所指的方法在 <CODE
CLASS="parameter"
>object</CODE
>
   所指的对象类中已定义，则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，否则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
  </P
><P
>&#13;   <TABLE
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><P
><B
>例 1. <B
CLASS="function"
>method_exists()</B
> 例子</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$directory </font><font color="#007700">= new </font><font color="#0000BB">Directory</font><font color="#007700">(</font><font color="#DD0000">'.'</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">method_exists</font><font color="#007700">(</font><font color="#0000BB">$directory</font><font color="#007700">,</font><font color="#DD0000">'read'</font><font color="#007700">));<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
>上例将输出：</P
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>
  </P
><P
>&#13;   参见 <A
HREF="function.function-exists.html"
><B
CLASS="function"
>function_exists()</B
></A
> 和
   <A
HREF="function.is-callable.html"
><B
CLASS="function"
>is_callable()</B
></A
>。
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