3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr=array(); for ($i=0;$i<=999999;$i++) { $arr[]=uniqid(); } foreach ($arr as $cur) { $arr1[]=$cur; } ?>
Output for 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 4096 bytes) in /in/Y5QBe on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33

Process exited with code 137.
preferences:
203.31 ms | 403 KiB | 303 Q