php基准时间的代码示例

Here is a little example of how to benchmark or time something with php
这里有一段php代码，教大家如何去处理基准时间。

代码如下：

<?php

// a function to  get microtime
function getmicrotime(){
  list($usec, $sec) = explode(" ",microtime());
  return ((float)$usec + (float)$sec);
}

// start time
$time_start = getmicrotime();

// a little loop to time
for ($i=0; $i < 10000; $i++)
{
// print the loop number
echo $i.'<br />';
}

// the end time
$time_end = getmicrotime();

// subtract the start time from the end time to get the time taken
$time = $time_end - $time_start;

// echo a little message
echo '<br />Script ran for ' . round($time,2) .' seconds.';

?>

This will produce a list of numbers from 0 to 9999 in your browser and tell you how long it took too complete the iterations.
以上将产生一个从0到9999的数字列表，以及完成这些计算任务所消耗的时间。

总结：以上主要演示了microtime()函数的用法。