3v4l.org

run code in 500+ PHP versions simultaneously
<?php class A { public function __construct( public final string $x ) {} } final class B extends A { public function __construct( public string $x ) {} }

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
8.3.50.0050.01216.67

preferences:
40.51 ms | 489 KiB | 4 Q