is_a
Checks whether the object is of a given type or subtype
Description
bool is_a(mixed $object_or_class, string $class, bool $allow_string = false)
Parameters
-
object_or_class
-
A class name or an object instance.
-
class
-
The class or interface name
-
allow_string
-
If this parameter set to false, string class name as object_or_class
is not allowed. This also prevents from calling autoloader if the class doesn't exist.
Return Values
Returns true if object_or_class is the
class object type,
or has class as one of its supertypes, false otherwise.
Examples
Example #1 is_a example
<?php
// define a class
class WidgetFactory
{
var $oink = 'moo';
}
// create a new object
$WF = new WidgetFactory();
if (is_a($WF, 'WidgetFactory')) {
echo "yes, \$WF is still a WidgetFactory\n";
}
?>
Example #2 Using the instanceof operator
<?php
if ($WF instanceof WidgetFactory) {
echo 'Yes, $WF is a WidgetFactory';
}
?>
See Also
- get_class
- get_parent_class
- is_subclass_of