is_a
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
is_a — Checks if the object is of this class or has this class as one of its parents
Beschreibung
Checks if the given object_or_class
is of this class or has
this class as one of its parents.
Parameter-Liste
-
object_or_class
-
A class name or an object instance.
-
class
-
The class name
-
allow_string
-
If this parameter set to
false
, string class name asobject_or_class
is not allowed. This also prevents from calling autoloader if the class doesn't exist.
Rückgabewerte
Returns true
if the object is of this class or has this class as one of
its parents, false
otherwise.
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
<?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 oder sie implementiert