testing - best way to measure (and refine) performance with PHP? -

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a site working starting little sluggish, , refine it. think problem php, can't sure. how can see how long functions taking perform?

if want test execution time : 

<?php     $starttime = microtime(true);       // content test     $endtime = microtime(true);       $elapsed = $endtime - $starttime;     echo "execution time : $elapsed seconds"; ?>

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