3v4l.org

run code in 300+ PHP versions simultaneously
<?php $start = memory_get_usage(true); $str = str_repeat('0123456789', 100); var_dump(memory_get_usage(true) - $start);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.13, 7.3.0 - 7.3.1
int(0)

preferences:
132.54 ms | 403 KiB | 149 Q