3v4l.org

run code in 300+ PHP versions simultaneously
<?php class B { protected static $c = 1; } class C1 extends B { function f(B $x) { return $x::$c; } } class C2 extends B { protected static $c = 2; } var_dump((new C1)->f(new C2));
Output for 8.4.12 - 8.4.18, 8.5.0 - 8.5.3
int(2)
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.11
Fatal error: Uncaught Error: Cannot access protected property C2::$c in /in/2Ue97:9 Stack trace: #0 /in/2Ue97(17): C1->f(Object(C2)) #1 {main} thrown in /in/2Ue97 on line 9
Process exited with code 255.
preferences:
96.49 ms | 854 KiB | 4 Q