Online PHP editor | output for TqUUf

<?php class A { public static $foo = 'foo'; public $thisvars = array(); public $selfvars = array(); public $staticvars = array(); public function __construct() { $this->addFoo(); } public function addFoo() { $this->selfvars[] = self::$foo; $this->staticvars[] = static::$foo; $this->thisvars[] = $this::$foo; } } class B extends A { public static $foo = 'bar'; public function __construct() { parent::__construct(); $this->addFoo(); } } $b = new B; print_r($b->selfvars); print_r($b->staticvars); print_r($b->thisvars); class C { public static $foo = 'foo'; public $vars = array(); public function __construct() { $this->addFoo(__CLASS__); } public function addFoo($class) { $this->vars[] = $class::$foo; } } class D extends C { public static $foo = 'bar'; public function __construct() { parent::__construct(); $this->addFoo(__CLASS__); } } $d = new D; print_r($d->vars);