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>property_exists</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN17178"
></A
><P
>    (PHP 5 &#62;= 5.1.0RC1)</P
>property_exists&nbsp;--&nbsp;检查对象或类是否具有该属性</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN17181"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>property_exists</B
> ( mixed class, string property )<BR
></BR
><P
>&#13;   本函数检查给出的 <CODE
CLASS="parameter"
>property</CODE
> 是否存在于指定的类中（以及是否能在当前范围内访问）。
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    As opposed with <A
HREF="function.isset.html"
><B
CLASS="function"
>isset()</B
></A
>,
    <B
CLASS="function"
>property_exists()</B
> returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> even if the property
    has the value <TT
CLASS="constant"
><B
>NULL</B
></TT
>.
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN17200"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>class</CODE
></DT
><DD
><P
>&#13;        字符串形式的类名或要检查的类的一个对象
       </P
></DD
><DT
><CODE
CLASS="parameter"
>property</CODE
></DT
><DD
><P
>&#13;        属性的名字
       </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN17214"
></A
><H2
>返回值</H2
><P
>&#13;   如果该属性存在则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，如果不存在则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>，出错返回 <TT
CLASS="constant"
><B
>NULL</B
></TT
>。
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN17220"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN17223"
></A
><P
><B
>例 1. <B
CLASS="function"
>property_exists()</B
> 例子</B
></P
><TABLE
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#007700">class </font><font color="#0000BB">myClass </font><font color="#007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">public $mine</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">private $xpto</font><font color="#007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;static function </font><font color="#0000BB">test</font><font color="#007700">() {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">property_exists</font><font color="#007700">(</font><font color="#DD0000">'myClass'</font><font color="#007700">, </font><font color="#DD0000">'xpto'</font><font color="#007700">)); </font><font color="#FF8000">// true, it can be accessed from here<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#007700">}<br />}<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">property_exists</font><font color="#007700">(</font><font color="#DD0000">'myClass'</font><font color="#007700">, </font><font color="#DD0000">'mine'</font><font color="#007700">));&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">//true<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">property_exists</font><font color="#007700">(new </font><font color="#0000BB">myClass</font><font color="#007700">, </font><font color="#DD0000">'mine'</font><font color="#007700">)); </font><font color="#FF8000">//true<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">property_exists</font><font color="#007700">(</font><font color="#DD0000">'myClass'</font><font color="#007700">, </font><font color="#DD0000">'xpto'</font><font color="#007700">));&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">//false, isn't public<br /></font><font color="#0000BB">myClass</font><font color="#007700">::</font><font color="#0000BB">test</font><font color="#007700">();<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN17227"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><TR
><TD
><A
HREF="function.method-exists.html"
><B
CLASS="function"
>method_exists()</B
></A
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></P
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