PHP计算搜索过程所用的时间 ``` <?php $time1 = ceil(microtime(true) * 1000); $a = 0; for ($x = 0; $x <= 700000; $x++) { $a += 1; } echo $a . '<br/>'; $time2 = ceil(microtime(true) * 1000); $time_search = ($time2 - $time1)/1000; echo $time_search; ```