PHP: Checks if the object has this class as one of its parents

Description

bool is_subclass_of ( mixed $object , string $class_name )

Checks if the given object has the class class_name as one of its parents.

Parameters

object: A class name or an object instance
class_name: The class name

Return Values

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

ChangeLog

Version Description

5.0.3 You may also specify the object parameter as a string (the name of the class)

Examples

Example #1 is_subclass_of() example


<?php

// define a class

class WidgetFactory

{

  var $oink = 'moo';

}



// define a child class

class WidgetFactory_Child extends WidgetFactory

{

  var $oink = 'oink';

}



// create a new object

$WF = new WidgetFactory();

$WFC = new WidgetFactory_Child();



if (is_subclass_of($WFC, 'WidgetFactory')) {

  echo "yes, \$WFC is a subclass of WidgetFactory\n";

} else {

  echo "no, \$WFC is not a subclass of WidgetFactory\n";

}





if (is_subclass_of($WF, 'WidgetFactory')) {

  echo "yes, \$WF is a subclass of WidgetFactory\n";

} else {

  echo "no, \$WF is not a subclass of WidgetFactory\n";

}





// usable only since PHP 5.0.3

if (is_subclass_of('WidgetFactory_Child', 'WidgetFactory')) {

  echo "yes, WidgetFactory_Child is a subclass of WidgetFactory\n";

} else {

  echo "no, WidgetFactory_Child is not a subclass of WidgetFactory\n";

}

?>

The above example will output:

yes, $WFC is a subclass of WidgetFactory
no, $WF is not a subclass of WidgetFactory
yes, WidgetFactory_Child is a subclass of WidgetFactory

is_subclass_of

Description

Parameters

Return Values

ChangeLog

Examples

See Also