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<?php var_dump($a = memory_get_usage()); $abc = [ 'a' => 'askdasd', 'b' => 'adasdkasd', 'c' => 'adasdkasd', 'd' => 'adasdkasd', 'e' => 'adasdkasd', 'f' => 'adasdkasd', 'g' => 'dkasdasas', 'h' => 'asdkasdas', 's' => 'assdasdaa', 'k1' => 'asdkasdaa', 'a1' => 'askdasd', 'b1' => 'adasdkasd', 'c1' => 'adasdkasd', 'd1' => 'adasdkasd', 'e1' => 'adasdkasd', 'f1' => 'adasdkasd', 'g1' => 'dkasdasas', 'h1' => 'asdkasdas', 's1' => 'assdasdaa', 'k2' => 'asdkasdaa', 'a3' => 'askdasd', 'b3' => 'adasdkasd', 'c2' => 'adasdkasd', 'd4' => 'adasdkasd', 'e2' => 'adasdkasd', 'f4' => 'adasdkasd', 'g2' => 'dkasdasas', 'h4' => 'asdkasdas', 's6' => 'assdasdaa', 'k7'=> 'asdkasdaa' ]; /*$abc = null;*/ var_dump(memory_get_usage() - $a); $a = memory_get_usage(); $abc = (array) $abc; var_dump(memory_get_usage() - $a); $a = memory_get_usage(); unset($abc); var_dump(memory_get_usage() - $a);
Output for 7.2.0
int(386952) int(32) int(0) int(0)
Output for 7.1.0, 7.1.7
int(350280) int(32) int(0) int(0)
Output for 7.1.5 - 7.1.6
int(350728) int(32) int(0) int(0)
Output for 7.0.0 - 7.0.20
int(350280) int(1368) int(0) int(-1336)
Output for 5.6.0 - 5.6.26
int(221392) int(4792) int(-24) int(-4584)

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