<?php function xrange($start, $limit, $step = 1) { for ($i = $start; $i <= $limit; $i += $step) { yield $i; } } $time = microtime(true); $first = implode(' ', range(1,1000, 2)); $time1 = microtime(true); $second = implode(' ', xrange(1, 1000, 2)); $time2 = microtime(true); var_dump($time2- $time1, $time1 - $time);
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