(PHP 4 >= 4.2.0, PHP 5, PHP 7)
is_a — Checks if the object is of this class or has this class as one of its parents
is_a ( mixed $object , string $class_name [, bool $allow_string = false ] ) : bool
Checks if the given object
is of this class or has this class as one of its parents.
object
A class name or an object instance.
class_name
The class name
allow_string
If this parameter set to false
, string class name as object
is not allowed. This also prevents from calling autoloader if the class doesn't exist.
Returns true
if the object is of this class or has this class as one of its parents, false
otherwise.
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'; } ?>
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https://www.php.net/manual/en/function.is-a.php