3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array_fill(0, 10000, true); var_dump(memory_get_usage()); foreach($a as $k => $v){ unset($a[$k]); } var_dump(memory_get_usage()); $b = $a; var_dump(memory_get_usage());
Output for 7.4.0
int(916328) int(916360) int(916360)
Output for 7.3.0 - 7.3.12
int(916248) int(916280) int(916280)
Output for 7.2.0 - 7.2.25
int(912304) int(912336) int(912336)
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
int(875696) int(875728) int(875728)
Output for 5.6.0 - 5.6.38
int(1229288) int(349536) int(349624)
Output for 5.5.0 - 5.5.38
int(1229288) int(349520) int(349608)
preferences:
152.74 ms | 401 KiB | 188 Q