Online PHP editor | output for dDbH8

<?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);