Php/docs/function.is-a
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is_a
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
is_a — Checks if the object is of this class or has this class as one of its parents
Description
is_a
( mixed $object
, string $class_name
[, bool $allow_string
= FALSE
] ) : bool
Checks if the given object
is of this class or has
this class as one of its parents.
Parameters
object
- A class name or an object instance.
class_name
- The class name
allow_string
- If this parameter set to
FALSE
, string class name asobject
is not allowed. This also prevents from calling autoloader if the class doesn't exist.
Return Values
Returns TRUE
if the object is of this class or has this class as one of
its parents, FALSE
otherwise.
Examples
Example #1 is_a() example
<?php// define a classclass WidgetFactory{ var $oink = 'moo';}// create a new object$WF = new WidgetFactory();if (is_a($WF, 'WidgetFactory')) { echo "yes, \$WF is still a WidgetFactory\n";}?>
Example #2 Using the instanceof operator in PHP 5
<?phpif ($WF instanceof WidgetFactory) { echo 'Yes, $WF is a WidgetFactory';}?>
See Also
- get_class() - Returns the name of the class of an object
- get_parent_class() - Retrieves the parent class name for object or class
- is_subclass_of() - Checks if the object has this class as one of its parents or implements it