unexplainable - page generation time class

[James Williams <james.williams@xxxxxxxxxx>]

Howdy!  I've made a class which simply determines the page generation 
time of a php script... After pretty much an hour of straight examining 
the code and trying tons of different things, no good has come of it, 
however I can't find an error... anywhere.

<?php
class page_gen {
       //
       // PRIVATE - DO NOT MODIFY
       //
       var $cls_start_time;
       var $cls_stop_time;
       var $cls_gen_time;
       
       //
       // FIGURE OUT THE TIME AT THE BEGINNING OF THE PAGE
       //
       function start() {
           $microstart = explode(' ',microtime());
           $this->cls_start_time = $microstart[0] + $microstart[1];
       }
       
       //
       // FIGURE OUT THE TIME AT THE END OF THE PAGE
       //
       function stop() {
           $microstop = explode(' ',microtime());
           $this->cls_stop_time = $microstop[0] + $microstop[1];
       }
       
       //
       // CALCULATE THE DIFFERENCE BETWEEN THE BEGINNNG AND THE END AND 
COLOR CODE THE RESULT
       //
       function gen() {
           $this->cls_gen_time = $this->cls_stop_time - 
$this->cls_start_time;
           return $this->cls_gen_time;
       }
   }
?>

What happens is it simply returns the $this->cls_start_time variable.  

Both the start() and stop() functions work fine because to test them I 
put print commands at the end and they both returned proper results, the 
error appears to be in the line where I minus the start time from the 
end time.  It simply returns a negative start time instead of minusing 
the two.

I tried changing the minus to a plus for testing sake and it just took 
out the negative.  Does anybody have any idea what is going on here?  
Thanks-you

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