Log php processing time

[nchandra]

I want to log the time taken to serve a Prestashop PHP page e.g. search.php.

$start = utime();

//Put this at the end of page
call to search.php

$end = utime();
$run = $end - $start;
log($run)

I want to avoid putting this code in each page. Is there a way to put this code at one place and then delegate the call to the called page?