计算执行时间

//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';

microtime --  返回当前 UNIX 时间戳和微秒数