Front-End PHP entry -023-program execution time detection for key date functions

We often need to do the execution time execution efficiency judgment of the program.

The following ideas are implemented:

 
   
  

  
    
   
<?php
  
    
   
//记录开始时间
  
    
   

  
    
   
//记录结整时
  
    
   

  
    
   

  
    
   
// 开始时间 减去（-） 结束时间 得到程序的运行时间
  
    
   

  
    
   
?>
 
   
  

But let's not forget that the program is running too fast. It's just 0.00000 seconds to the flash. At this point, we're going to write a function of a special letter:

Mixed Microtime ([bool $get _as_float])

The Microtime () function, which returns the current Unix timestamp and the number of microseconds.

Parameters:
If you pass in true, it will return a floating-point type of time, so that it is convenient to participate in the operation.

Let's simulate an example that detects the execution time of a function and tests how quickly a function is efficient:

  
 

   
  

  
<?php
   
  

  
//开始时间
   
  

  
$time_start = microtime(true);
   
  

  

   
  

  
//循环一万次
   
  

  
for($i = 0 ; $i < 10000 ; $i++){
   
  

  

   
  

  

   
  

  
 //你可以用上，mktime() 生成一个昨天的时间
   
  

  

   
  

  
 //再用strtotime() 生成一个昨天的时间
   
  

  

   
  

  
 //对比两个函数认的效率高
   
  

  

   
  

  
}
   
  

  

   
  

  
//结整时间
   
  

  
$time_end = microtime(true);
   
  

  
//相减得到运行时间
   
  

  
$time = $time_end - $time_start;
   
  

  

   
  

  
echo "这个脚本执行的时间为 $time seconds\n";
   
  

  
?>
  
 

From for notes (Wiz)

Front-End PHP entry -023-program execution time detection for key date functions