Get PHP script execution time

Get PHP Script executation time with following simple php script

<?php
function page_loading_time()
{
    list ($msec, $sec) = explode(' ', microtime());
    $microtime = (float)$msec + (float)$sec;
    return $microtime;
}

// Capture current time at the Begining of the file
$start=page_loading_time();

usleep(100000);  // Delaying page output 0.1 second for testing purpose.
// Your Content Goes here


echo "<br />At the End of the File
";
$end = page_loading_time();
// Print results.
echo 'Page Loading Time: <b>' . round($end - $start, 2) . '</b> seconds';   
?>