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# Type Operators

PHP has a single type operator: instanceof is used to determine whether a given object, his parents or their implemented interfaces are of a specified object class.

The instanceof operator was introduced in PHP 5. Before this time is_a() was used but is_a() has since been deprecated in favor of instanceof.

`<?php class A { } class B { } $thing = new A; if ($thing instanceof A) { echo 'A'; } if ($thing instanceof B) { echo 'B'; } ?>`

As $thing is an object of type A, but not B, only the block dependent on the A type will be executed:

    A

See also get_class() and is_a().

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