<?php class A { public function __call($method, $args) { echo "A->$method\n"; } public static function __callStatic($method, $args) { echo "A::$method\n"; } } class B extends A { public function test1() { A::test1(); // A->test1 because A is related to B and test1 is non-static } public static function test2() { A::test2(); // A::test2 because A is related to B and test2 is static } } class C { public function test3() { A::test3(); // A::test3 because A is not related to C } public static function test4() { A::test4(); // A::test4 because A is not related to C } } $b = new B(); $b->test1(); $b::test2(); $c = new C(); $c->test3(); $c::test4();