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# Type Operators

PHP has a single type operator: `instanceof`. `instanceof` is used to determine whether a given object is of a specified object class.

`instanceof` was introduced in PHP 5.

    <?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

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