PHP Basic Tutorial

PHP Advanced Tutorial

PHP & MySQL

PHP reference manual

PHP Ctype Functions PHP Class/Object function

PHP is_subclass_of() function usage and example

PHP Class/Object function reference manual

is_subclass_of - If this object is a subclass of the class, it returns TRUE

Syntax

is_subclass_of($object, $class_name);

Definition and usage

It checks whether the given object has class_name class as one of its parent objects.

Parameter

Number	Parameters and descriptions
1	object (required) The object to be tested
2	class (required) Class name.

Return value

　If the class of the object object is a subclass of class class_name, it returns TRUE, otherwise it returns FALSE.

Online example

The following is the usage of this function-

Example

<?php
　　　//Define a class
　　　class wid_fact {
　　　　　　var $oink = 'moo';
　　　}
　　　
　　　//Define a subclass
　　　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";
　　　}
?>

Test and see‹/›

It will produce the following result-

Yes, $WFC is a subclass of wid_fact
No, $WF is not a subclass of wid_fact

　 PHP Class/Object function reference manual

PHP Ctype Functions PHP Class/Object function