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Calculation page load time in PHP is a very simple task. First you have to save the time at the very beginning of the page and at the very end of the page. Then just subtract the them to find out the page load time.

A simple working php example is as follows which used microtime( ) php function to get the current system time in microseconds.

Start of Page:

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   @list($iMicroSeconds, $iSeconds) = @explode(" ", @microtime( ));
   $iPageStartTime = ((float)$iMicroSeconds + (float)$iSeconds);


End of Page:

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   @list($iMicroSeconds, $iSeconds) = @explode(" ", @microtime( ));
   $iPageEndTime = ((float)$iMicroSeconds + (float)$iSeconds);


Now you can display the page load time as follows:

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   $fPageLoadTime = @round(($iPageEndTime - $iPageStartTime), 3);

       print "Page Load Time = $fPageLoadTime Seconds";