PHP is_subclass_of()用法及代码示例

用法

is_subclass_of ( $object, $class_name );

定义和用法

它检查给定对象是否将类 class_name 作为其父对象之一。

参数

Sr.No	参数及说明
1	object(Required) 被测对象
2	class(Required) 类名称。

返回值

如果对象对象属于 class_name 的子类，则此函数返回 TRUE，否则返回 FALSE。

示例

下面是这个函数的用法～

<?php
   // define a class
   class wid_fact {
      var $oink = 'moo';
   }
   
   // define a child class
   class wid_fact_child extends wid_fact {
      var $oink = 'oink';
   }
   
   // create a new object
   $WF = new wid_fact();
   $WFC = new wid_fact_child();
   
   if (is_subclass_of($WFC, 'wid_fact')) {
      echo "yes, \$WFC is a subclass of wid_fact \n";
   }else {
      echo "no, \$WFC is not a subclass of wid_fact \n";
   }
   
   if (is_subclass_of($WF, 'wid_fact')) {
      echo "yes, \$WF is a subclass of wid_fact \n";
   }else {
      echo "no, \$WF is not a subclass of wid_fact \n";
   }
?>

它将产生以下结果 -

yes, $WFC is a subclass of wid_fact
no, $WF is not a subclass of wid_fact