3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = []; /* record T(int $x, int $y); */ readonly class T { public function __construct(public int $x, public int $y) {}} // emulate a record $t = new T(1,2); for($x = 0; $x <= 100_000; $x++) $arr[] = $t /* &T(1,2) */ ; echo "Current memory usage: " . (memory_get_usage() / 1024) . " KB\n"; echo "Peak memory usage: " . (memory_get_peak_usage() / 1024) . " KB\n";
Output for 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
Current memory usage: 2432.265625 KB Peak memory usage: 2432.3984375 KB
Output for 8.1.0 - 8.1.30
Parse error: syntax error, unexpected token "readonly", expecting end of file in /in/4nYXG on line 6
Process exited with code 255.
preferences:
50.07 ms | 407 KiB | 5 Q