3v4l.org

run code in 300+ PHP versions simultaneously
<?php $memory1 = memory_get_usage(true); print 'before: ' . $memory1 ."\n"; $keys = array(); for ($i = 0; $i<100000; $i++) { $keys[] = 'pref:keyname:' . rand(1000000, 9999999); } asort($keys); $memory2 = memory_get_usage(true); print 'after: ' . $memory2 ."\n"; print 'allocated: ' . ($memory2 - $memory1);
Output for 7.3.0 - 7.3.12, 7.4.0
before: 2097152 after: 11534336 allocated: 9437184
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.25
before: 2097152 after: 11010048 allocated: 8912896
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
before: 262144 after: 19136512 allocated: 18874368
Output for 5.3.0 - 5.3.29
before: 786432 after: 19660800 allocated: 18874368
Output for 5.2.6 - 5.2.17
before: 262144 after: 18350080 allocated: 18087936
Output for 5.2.1 - 5.2.5
before: 262144 after: 18087936 allocated: 17825792
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
Fatal error: Call to undefined function memory_get_usage() in /in/I9o9E on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: memory_get_usage() in /in/I9o9E on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: memory_get_usage() in /in/I9o9E on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: memory_get_usage() in /in/I9o9E on line 2
preferences:
169.73 ms | 401 KiB | 222 Q