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PHP | is_subclass_of() Function

PHP is_subclass_of() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP is_subclass_of() Function.

The built-in PHP is_subclass_of() Function checks whether the provided object has the class class_name as one of its parents.


Following below is the syntax to use this function -

is_subclass_of ( $object, $class_name );

Parameter Details

Sr.NoParameter & Description


The tested object



The class name.

Return Value

This built-in PHP function returns TRUE if the object object belongs to a class which is a subclass of the class_name, otherwise FALSE.


Try out the below example -

   // 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";


When the above code is executed, it will produce the following result -

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

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP method_exists() Function.

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