<?php class A { static $x = "A"; function testit() { $this->v1 = new sELF(); $this->v2 = new SELF(); } } class B extends A { static $x = "B"; function testit() { PARENT::testit(); $this->v3 = new sELF(); $this->v4 = new PARENT(); $this->v4 = STATIC::$x; } } $t = new B(); $t->testit(); var_dump($t);