Measure script execution time - PHP Snippet

This php code will calculate how many seconds it to a script to start and then end.

//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 exicute';