<?php // makes a big map $map = []; for($a = 0; $a < 55555; $a++){ $map["key" . $a] = (object)(array)["x" => $a]; } // empty the map (or partially empty it) for($a = 0; $a < 55555; $a++){ unset($map["key" . $a]); } // at this point $map's length is nexPow2(55555), even if it is empty $om = memory_get_usage(); echo $om . "\n"; (function(array $map){ $map["sup"] = "copy"; // copy on write allocates another nexPow2(55555) array, // rather than starting with a small one $nm = memory_get_usage(); echo $nm . "\n"; })($map);
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