<?php $value = base64_encode(md5('')); $start = microtime(true); for ($i = 0; $i < 100; ++$i) { $soFar = ''; $callback = function ($value) use (&$soFar) { return $soFar .= $value; }; $result = array_map($callback, str_split($value)); } $end = microtime(true); echo $i/($end - $start), ' op/s'; var_dump($result);
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