3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = []; $mem = mem_get_real_usage(true); echo $mem; $c = new \stdClass(); $a[] = $c; echo mem_get_real_usage(true) - $mem; $a[] = $c; echo mem_get_real_usage(true) - $mem;
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function mem_get_real_usage() in /in/aIvnc:5 Stack trace: #0 {main} thrown in /in/aIvnc on line 5
Process exited with code 255.
Output for 5.4.12 - 5.6.28
Fatal error: Call to undefined function mem_get_real_usage() in /in/aIvnc on line 5
Process exited with code 255.
Output for 5.3.22 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/aIvnc on line 3
Process exited with code 255.