[PHP]How to check if a class inherits another class without instantiating it?

Question

I have some class name. How to check if a class inherits another class without instantiating it?

 if (!class_exists($controller)) //AND I have check type
            


        

Answer 1

You can use is_subclass_of:

http://php.net/manual/en/function.is-subclass-of.php

class TestA {}
class TestB extends TestA {}
class TestC extends TestB {}

var_dump(is_subclass_of('TestA', 'TestA')); // false
var_dump(is_subclass_of('TestB', 'TestA')); // true
var_dump(is_subclass_of('TestC', 'TestA')); // true