Online PHP editor | output for GpUI2

<?php abstract class Lol { protected static $cache = NULL; public static function setCacheFromLol() { static::$cache = "Lol"; } public static function getCacheFromLol() { return static::$cache; } } class Lol1 extends Lol { public static function setCacheFromLol1() { static::$cache = "Lol1"; } public static function getCacheFromLol1() { return static::$cache; } } class Lol2 extends Lol { public static function setCacheFromLol2() { static::$cache = "Lol1"; } public static function getCacheFromLol2() { return static::$cache; } } Lol1::setCacheFromLol1(); echo Lol2::getCacheFromLol2(); // Lol1 Lol1::setCacheFromLol(); echo Lol2::getCacheFromLol2(); // Lol