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run code in 300+ PHP versions simultaneously
<?php class Obj { public function __construct() { $this->things[] = $this; } public function __destruct() { $this->things[] = null; } private $things = []; } for ($i = 0; $i < 1000000; ++$i) { $obj = new Obj(); }
Output for 5.5.0 - 5.5.26, 5.5.28 - 5.5.33, 5.6.0 - 5.6.19, 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.23, 8.1.0 - 8.1.10
Output for 5.5.27, 7.0.1 - 7.0.4

Process exited with code 137.
Output for 7.0.0
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 20480 bytes) in /in/lHeRV on line 12
Process exited with code 255.

preferences:
19.89 ms | 409 KiB | 5 Q