PHP计算程序执行时间

[php]代码库

//Create a variable for start time 
$time_start = microtime(true); 
 
// Place your PHP/HTML/JavaScript/CSS/Etc. Here 
 
//Create a variable for end time 
$time_end = microtime(true); 
//Subtract the two times to get seconds 
$time = $time_end - $time_start; 
 
echo 'Script took '.$time.' seconds to execute';