PHP : Calculate the execution time of a script

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//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';

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