How to calculate script running time in php?

This article mainly introduces the sharing of simple examples of PHP calculating program running time. Friends who need it can refer to it

First we analyze the principle. If we want to get the program running time, we can run it at the beginning of the program. Define a variable to record the current time, and then record the current time after our program is finished running. The difference between the two is the time it takes to run the program.

Here we introduce the microtime() function. Microtime() is not used much, but we must know this function. It returns the current Unix timestamp and Number of microseconds. For example: echo microtime(); will return: 0.08845800 1376983061. So you can use the explode function to split it into an array with spaces as the identifier, then $starttime[0]=0.08845800 (microseconds), $starttime[1] =1376983061 (the current number of seconds, equivalent to the result obtained by time()).
Sample code:

<?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++){
  $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();
?>

Finally, subtract the two times, and then use the round() function to retain the required decimal places for the execution time. For example, here is the calculation time required to loop one million times: 0.116 seconds, as shown below:

In order to make the program neat, we can write this code into a class , introduce it when used, instantiate this class before the program starts, and then call a method at the end to achieve this function.

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