(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
Checks if the given object is of this class or has this class as one of its parents.
The tested object
The class name
Returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.
| 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. |
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';
}
?>