<?php $arr1 = array(); $arr2 = array(); for ($i = 0; $i < 10000000; $i++) { $arr1[$i] = 'a'; $arr2[$i] = 'a'; } $start = microtime(true); for ($i = 0; $i < 10000000; $i++) { $arr1[$i] = null; } $elapsed = microtime(true) - $start; echo 'took '. $elapsed .'seconds<br>'; $start = microtime(true); for ($i = 0; $i < 10000000; $i++) { unset($arr2[$i]); } $elapsed = microtime(true) - $start; echo 'took '. $elapsed .'seconds<br>';
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