<?php $b_time = microtime(true); $a = array("1","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2","2","1","2","1","2","1","2","1","2","1","2"); $count = 0; foreach ($a as $key => $value) { foreach ($a as $key => $value) { foreach ($a as $key => $value) { $b = 1*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8*1*8*8; //$count++; } } } $e_time = microtime(true); $taketime = $e_time-$b_time; //echo $taketime; echo $taketime; //3.5078401565552 //0.68016886711121 //15.500303983688 ?>
它能精确到很细微的时间。不仅仅是秒。
在代码执行体首尾加上，可以检测执行的时间情况。
清晰代码的执行效率。
本文转自TBHacker博客园博客，原文链接：http://www.cnblogs.com/jiqing9006/p/3935322.html，如需转载请自行联系原作者
