Online PHP editor | output for GtdRr

<?php function bytesToSize($bytes, $precision = 2) { $symbols = array('B', 'Kb', 'Mb', 'Gb', 'Tb', 'Pb', 'Eb', 'Zb', 'Yb'); $exp = (int)floor(log($bytes) / log(1024)); return sprintf('%.'. $precision .'f '. $symbols[$exp], $bytes / pow(1024, floor($exp))); } function mem() { return bytesToSize(memory_get_usage(true)); } function test($msg, $test) { $t = microtime(true); $test($msg); echo $msg .': '. sprintf('%.6f', microtime(true) - $t) .' '; } $array = range(0, 3000000); test('foreach', function ($msg) use ($array) { echo $msg . ' before loop mem: '. mem() .' '; foreach ($array as $v) { $b = $v; } echo $msg . ' after loop mem: '. mem() .' '; }); test('foreach ref', function ($msg) use ($array) { echo $msg . ' before loop mem: '. mem() .' '; foreach ($array as &$v) { $b = $v; } unset($v); echo $msg . ' after loop mem: '. mem() .' '; }); test('for', function ($msg) use ($array) { echo $msg . ' before loop mem: '. mem() .' '; $so = count($array); for ($i = 0; $i < $so; ++$i) { $b = $array[$i]; } echo $msg . ' after loop mem: '. mem() .' '; }); test('while each -> list', function ($msg) use ($array) { echo $msg . ' before loop mem: '. mem() .' '; while (list($k, $v) = each($array)) { $b =$v; } echo $msg . ' after loop mem: '. mem() .' '; });