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run code in 150+ php & hhvm versions
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<?php var_dump($a = memory_get_usage()); $foo = 1; var_dump($b = memory_get_usage()); var_dump($b - $a);
based on 7b49p
Output for 7.0.0 - 7.1.0
int(346088) int(346120) int(32)
Output for 5.6.7 - 5.6.28
int(216800) int(217144) int(344)
Output for 5.5.24 - 5.5.35
int(216800) int(217104) int(304)
Output for 5.4.10 - 5.4.45
int(217320) int(217624) int(304)
Output for 5.4.0 - 5.4.9
int(216792) int(217096) int(304)
Output for 5.3.11 - 5.3.29
int(619824) int(620144) int(320)
Output for 5.3.0 - 5.3.10
int(619520) int(619840) int(320)
Output for 5.2.10 - 5.2.17
int(77464) int(77768) int(304)
Output for 5.2.7 - 5.2.9
int(77896) int(78208) int(312)
Output for 5.2.3 - 5.2.6
int(78216) int(78528) int(312)
Output for 5.2.1 - 5.2.2
int(76112) int(76384) int(272)
Output for 5.0.0 - 5.2.0
Fatal error: Call to undefined function memory_get_usage() in /in/93YsL on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: memory_get_usage() in /in/93YsL on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: memory_get_usage() in /in/93YsL on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: memory_get_usage() in /in/93YsL on line 2