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
Description
Checks if the given object_or_class is of this class or has
this class as one of its parents.
Parameters
-
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_classis 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 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
<?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 or implements it
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