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<?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()); } }
Output for 7.4.0 - 7.4.1
int(388024) int(388056) int(388056) int(388056)
Output for 7.3.0 - 7.3.13
int(387944) int(387976) int(387976) int(387976)
Output for 7.2.0 - 7.2.26
int(384064) int(384096) int(384096) int(384096)
Output for 7.1.0 - 7.1.33
int(347392) int(347424) int(347424) int(347424)
Output for 7.0.0 - 7.0.33
int(347768) int(347800) int(347800) int(347800)
Output for 5.6.0 - 5.6.40
int(218616) int(218864) int(218864) int(218864)
Output for 5.5.0 - 5.5.38
int(218616) int(218848) int(218848) int(218848)
Output for 5.4.10 - 5.4.45
int(219136) int(219368) int(219368) int(219368)
Output for 5.4.0 - 5.4.9
int(218608) int(218840) int(218840) int(218840)
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/mSTHE 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/mSTHE on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/mSTHE on line 3
Process exited with code 255.

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