Online PHP editor | output for NqOME

<?php interface czlowiek { function a(); function b(); } class dupa extends czlowiek{ public function a() {}; public function b(){}; public $a; public static $NICE = 'STATIC_VALUE'; public function __construct($param) { $this->a = $param; echo '+_construct'.$this->a.self::$NICE; } public static function statek(){ echo "\nWywolano metode statyczna"; } public function __call($a, $b) { echo "\n".'Wywolano metodę \''.$a.'\' z parametrami:'."\n"; foreach($b as $i=>$val) { echo 'indeks: '.$i.' wartosc: '.$val."\n"; } } public function setA($a) { $this->a = $a; } }; $a = new dupa('blabla'); echo $a->a; $b = new dupa(''); echo $b->a; $b->setA('bb'); $b->setb('bb',8,true); echo dupa::$NICE; dupa::statek(); ?>