Online PHP editor | output for Qig0E

<?php class a {} $a = new a; $b = '\\a'; var_dump($a instanceof $b); var_dump($a instanceof \a); // C is not a constant, but a class name (see use) const object = '\\a'; var_dump($a instanceof object); use a as c; var_dump($a instanceof c); // compile error : unexpected T_CLASS // var_dump($a instanceof a::class); // compile error : unexpected T_CONSTANT_ENCAPS_STRING // var_dump($a instanceof 'a');