3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [1,2,3]; var_dump(memory_get_usage()); foreach ($arr as $k => $v) { current($arr); } var_dump(key($arr));
Output for 7.2.0
int(383440) int(0)
Output for 7.1.0, 7.1.7
int(346800) int(0)
Output for 7.1.5 - 7.1.6
int(346992) int(0)
Output for 7.0.0 - 7.0.20
int(347176) int(0)
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
int(218560) int(1)
Output for 5.4.10 - 5.4.45
int(219064) int(1)
Output for 5.4.0 - 5.4.9
int(218536) int(1)
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/oVopK on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/oVopK on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/oVopK on line 3
Process exited with code 255.

preferences:
159.19 ms | 401 KiB | 218 Q