How to calculate program running time in php

1. Functions used

a. Use the function microtime ()

microtime ( bool $get_as_float = ? ) : mixed

• $get_as_float which can be omitted when set to TRUE When , it is specified that the function should return a floating point number, otherwise it returns a string. Default is FALSE.

• Return value: Default return string , where sec is the since Unix epoch (0:00:00 January 1, 1970 GMT) The number of seconds since, microsec is the microsecond part. If the argument is set to TRUE, returns a floating point number representing the current time in seconds since the Unix epoch, accurate to microseconds.

b. Use the function explode()

explode(separator,string,limit)

• separator to specify where to split characters string.

• string The string to be split.
  

• limit specifies the number of array elements returned (optional)

2. The code is as follows :

<?php    
//程序运行时间  
$starttime = explode(&#39; &#39;,microtime());  
echo microtime(); 
 /*········以下是代码区·········*/  
 for($i=0;$i<1000000;$i++)//这里是计算循环一百万次所需要的时间为：0.116秒。
 {   $i;  
 }  
 /*········以上是代码区·········*/   
 //程序运行时间  
 $endtime = explode(&#39; &#39;,microtime());  
 $thistime = $endtime[0]+$endtime[1]-($starttime[0]+$starttime[1]); 
 $thistime = round($thistime,3);  
 echo "本网页执行耗时：".$thistime." 秒。".time(); ?>

3. Output:

0.58607300 1617257726本网页执行耗时：0.017 秒。1617257726

PS: For the sake of neatness of the program, we can use this code This function can also be achieved by writing it as a class, introducing it when used, instantiating the class before the program starts, and calling a method at the end.

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