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run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = [1,2,3]; var_dump(memory_get_usage()); foreach ($arr as $k => $v) { var_dump(memory_get_usage()); if (!isset($arr[$k])) { var_dump(memory_get_usage()); } } var_dump(key($arr));
Output for 7.1.0
int(347640) int(347672) int(347672) int(347672) int(0)
Output for 7.0.0 - 7.0.14
int(348016) int(348048) int(348048) int(348048) int(0)
Output for hhvm-3.10.0 - 3.12.0
int(2097152) int(2097152) int(2097152) int(2097152) int(0)
Output for 5.6.0 - 5.6.28
int(219064) int(219336) int(219336) int(219336) NULL
Output for 5.5.0 - 5.5.38
int(219064) int(219320) int(219320) int(219320) NULL
Output for 5.4.10 - 5.4.45
int(219584) int(219840) int(219840) int(219840) NULL
Output for 5.4.0 - 5.4.9
int(219056) int(219312) int(219312) int(219312) NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/0nHqk on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/0nHqk on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0nHqk on line 3
Process exited with code 255.