3v4l.org

run code in 500+ PHP versions simultaneously
<?php interface i { // no promoted property function __construct(int $a); } class x implements i { // promoted property function __construct(private int $a) {} } class y extends x { // valid extension of a promoted property function __construct(int $a) {} } ?>
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.6

preferences:
34.6 ms | 841 KiB | 4 Q