Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>is_subclass_of</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN17113"
></A
><P
>    (PHP 4, PHP 5)</P
>is_subclass_of&nbsp;--&nbsp;如果此对象是该类的子类，则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN17117"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>is_subclass_of</B
> ( object object, string class_name )<BR
></BR
><P
>&#13;   如果对象 <CODE
CLASS="parameter"
>object</CODE
>
   所属类是类 <CODE
CLASS="parameter"
>class_name</CODE
>
   的子类，则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，否则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    自 PHP 5.0.3 起也可以用一个字符串来指定 <CODE
CLASS="parameter"
>object</CODE
>
    参数（类名）。
   </P
></BLOCKQUOTE
></DIV
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN17137"
></A
><P
><B
>例 1. <B
CLASS="function"
>is_subclass_of()</B
> 例子</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">// define a class<br /></font><font color="#007700">class </font><font color="#0000BB">WidgetFactory<br /></font><font color="#007700">{<br />&nbsp;&nbsp;var </font><font color="#0000BB">$oink </font><font color="#007700">= </font><font color="#DD0000">'moo'</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">// define a child class<br /></font><font color="#007700">class </font><font color="#0000BB">WidgetFactory_Child </font><font color="#007700">extends </font><font color="#0000BB">WidgetFactory<br /></font><font color="#007700">{<br />&nbsp;&nbsp;var </font><font color="#0000BB">$oink </font><font color="#007700">= </font><font color="#DD0000">'oink'</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">// create a new object<br /></font><font color="#0000BB">$WF </font><font color="#007700">= new </font><font color="#0000BB">WidgetFactory</font><font color="#007700">();<br /></font><font color="#0000BB">$WFC </font><font color="#007700">= new </font><font color="#0000BB">WidgetFactory_Child</font><font color="#007700">();<br /><br />if (</font><font color="#0000BB">is_subclass_of</font><font color="#007700">(</font><font color="#0000BB">$WFC</font><font color="#007700">, </font><font color="#DD0000">'WidgetFactory'</font><font color="#007700">)) {<br />&nbsp;&nbsp;echo </font><font color="#DD0000">"yes, \$WFC is a subclass of WidgetFactory\n"</font><font color="#007700">;<br />} else {<br />&nbsp;&nbsp;echo </font><font color="#DD0000">"no, \$WFC is not a subclass of WidgetFactory\n"</font><font color="#007700">;<br />}<br /><br />if (</font><font color="#0000BB">is_subclass_of</font><font color="#007700">(</font><font color="#0000BB">$WF</font><font color="#007700">, </font><font color="#DD0000">'WidgetFactory'</font><font color="#007700">)) {<br />&nbsp;&nbsp;echo </font><font color="#DD0000">"yes, \$WF is a subclass of WidgetFactory\n"</font><font color="#007700">;<br />} else {<br />&nbsp;&nbsp;echo </font><font color="#DD0000">"no, \$WF is not a subclass of WidgetFactory\n"</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">// usable only since PHP 5.0.3<br /></font><font color="#007700">if (</font><font color="#0000BB">is_subclass_of</font><font color="#007700">(</font><font color="#DD0000">'WidgetFactory_Child'</font><font color="#007700">, </font><font color="#DD0000">'WidgetFactory'</font><font color="#007700">)) {<br />&nbsp;&nbsp;echo </font><font color="#DD0000">"yes, WidgetFactory_Child is a subclass of WidgetFactory\n"</font><font color="#007700">;<br />} else {<br />&nbsp;&nbsp;echo </font><font color="#DD0000">"no, WidgetFactory_Child is not a subclass of WidgetFactory\n"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
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><PRE
CLASS="screen"
>yes, $WFC is a subclass of WidgetFactory
no, $WF is not a subclass of WidgetFactory
yes, WidgetFactory_Child is a subclass of WidgetFactory</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
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>
  </P
><P
>&#13;   参见 <A
HREF="function.get-class.html"
><B
CLASS="function"
>get_class()</B
></A
>、 
   <A
HREF="function.get-parent-class.html"
><B
CLASS="function"
>get_parent_class()</B
></A
> 和 
   <A
HREF="function.is-a.html"
><B
CLASS="function"
>is_a()</B
></A
>。
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