3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A {} class_alias('A', 'B'); function f1(A $a) { } function f2(B $b) { } $a = new A(); f1($a); f2($a); $b = new B(); f1($b); f2($b);
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.17 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
preferences:
117.85 ms | 1707 KiB | 4 Q