<?php
class A {} class B extends A {}
var_dump(is_a('A','B'));
var_dump(is_a('B','A'));
var_dump(is_subclass_of('A','B'));
var_dump(is_subclass_of('B','A'));
var_dump(is_subclass_of('A','A'));
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/JZrdW on line 5
bool(false)
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/JZrdW on line 6
bool(false)
bool(false)
bool(true)
bool(false)
Output for 5.0.0 - 5.0.2
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/JZrdW on line 5
bool(false)
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/JZrdW on line 6
bool(false)
bool(false)
bool(false)
bool(false)