PHP Dokumentation: Function is-a
12. Januar 2010 von werner
is_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
Beschreibung
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.
Parameter-Liste
- object
The tested object
- class_name
The class name
Rückgabewerte
Returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.
Changelog
| Version | Beschreibung |
|---|---|
| 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. |
Beispiele
Beispiel #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";
}
?>Beispiel #2 Using the instanceof operator in PHP 5
<?php
if ($WF instanceof WidgetFactory) {
echo 'Yes, $WF is a WidgetFactory';
}
?>Siehe auch
- get_class() – Ermittelt den Klassennamen eines Objekts
- get_parent_class() – Gibt den Namen der Elternklasse eines Objektes zurück
- is_subclass_of() – Prüft ob ein Objekt von der angegebenen Klasse abstammt
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