<?php $a1 = array_fill(0, 100000, true); foreach($a1 as $k => $v){ unset($a1[$k]); } var_dump(memory_get_usage()); $a2 = $a1; // capacity will be same as original despite $a1 is empty $a2[] = true; var_dump(memory_get_usage()); unset($a1); var_dump(memory_get_usage());
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