<?php
interface I {}
class A {}
class B {}
class C extends A implements I {}
var_dump(is_a('C', 'C', true), is_a('C', 'I', true), is_a('C', 'A', true), is_a('C', 'B', true));
Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8
Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8
Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8
Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8
NULL
NULL
NULL
NULL
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8
Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8
Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8
Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8
Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8
NULL
NULL
NULL
NULL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/pGBkf on line 3
Process exited with code 255.