Syntax
| is_subclass_of ( $object, $class_name ); |
Definition and Usage
Checks if the given object has the class class_name as one of its parents.
Paramters
| Parameter | Description |
|---|---|
| object | Required. The tested object |
| class | Required. The class name. |
Return Value
This function returns TRUE if the object object, belongs to a class which is a subclass of class_name, FALSE otherwise.
Example
Following is the usage of this function:
<?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<br>";
} else {
echo "no, \$WFC is not a subclass of WidgetFactory<br>";
}
if (is_subclass_of($WF, 'WidgetFactory')) {
echo "yes, \$WF is a subclass of WidgetFactory<br>";
} else {
echo "no, \$WF is not a subclass of WidgetFactory<br>";
}
?>
|
It will produce following result:
yes, $WFC is a subclass of WidgetFactory no, $WF is not a subclass of WidgetFactory |
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