interface_existsis_a
(PHP 4 >= 4.2.0, PHP 5)
is_a — Checks if the object is of this class or has this class as one of its parents
Description
bool is_a
( object $object
, string $class_name
)
Checks if the given object is of this class or has this class as one of its parents.
Parameters
- object
-
The tested object
- class_name
-
The class name
Return Values
Returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.
Changelog
| Version | Description |
|---|---|
| 5.3.0 | This function is no longer deprecated, and will therefore no longer throw E_STRICT warnings. |
| 5.0.0 | This function became deprecated in favour of the instanceof operator. Calling this function will result in an E_STRICT warning. |
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 in PHP 5
<?php
if ($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
add a note
User Contributed Notesis_a
There are no user contributed notes for this page.