Online PHP editor | refs for Yetkm

<?php $count = 10000; $start = microtime(true); for($i = 0; $i < $count; $i++) { $a .= 'a'; } printf("#1, result is %d, done in %f\n", $y, microtime(true) - $start); $start = microtime(true); for($i = 0; $i < $count; $i++) { $a .= "a"; } printf("#2, result is %d, done in %f\n", $y, microtime(true) - $start);