is_subclass_of
(PHP 4 , PHP 5)
is_subclass_of --
Returns
TRUE if the object has this class as one of its parents
Description
bool
is_subclass_of ( object object, string class_name)
This function returns TRUE if the object
object, belongs to a class which is a
subclass of class_name, FALSE otherwise.
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";
}
// Outputs "yes, $WFC is a subclass of WidgetFactory\n";
if (is_subclass_of($WF, 'WidgetFactory')) {
echo "yes, \$WF is a subclass of WidgetFactory\n";
} else {
echo "no, \$WF is not a subclass of WidgetFactory\n";
}
// Outputs "no, $WF is not a subclass of WidgetFactory\n"
?>
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See also get_class(),
get_parent_class() and
is_a().