Show load time on page PHP

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Sometimes in PHP, we want to show load time on the page where the script is executed. Here is the code snippet for that.

In Top of the page:

<?php
$start_time = microtime(TRUE);
?>

In Where do you want to display the loading time:

<?php
$end_time = microtime(TRUE);
$time_taken =($end_time - $start_time)*1000;
$time_taken = round($time_taken,1);
echo '<p class="text-right"><samp>Page generated in <mark>'.$time_taken.'</mark> seconds</samp></p>';
?>