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run code in 150+ php & hhvm versions
Bugs & Features
<?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 7.0.0 - 7.1.0
before: 2097152 after: 11010048 allocated: 8912896
Output for hhvm-3.12.0
before: 305064 after: 11396600 allocated: 11091536
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 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 - 5.2.0
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 - 4.4.4
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