[Resolved] Execution timer brings up minus time?

jonno946

Hi there,

i have the following code for measuring and displaying how long the script took to execute:


<?php

// top of page

$start_timer = microtime(true);

// main content (function calls etc...)

// bottom of page
echo microtime(true) - $start_timer;

?>

It works most of the time, but then sometimes it displays a minus sign?

e.g: -0.771762

i've one by the manual so im unsure at why this is happening 😕

Thanks

Jonno

dalecosp

Which version of PHP are you using?

The snippet you've quoted is the recommended way for PHP5. Inserting (true) at the end of microtime with PHP4 will get you nowhere in particular ... i.e., you'll still have to reformat the value(s) returned by microtime before doing the math....

I imagine that if the UNIX timestamp has switched (gone up a second) during execution, that's when you get your funny result....

jonno946

Running PHP Verson 4.3.7

I was initially running it without declaring (true) andit still didn't work.

I inserted true as i thought it may resolve the problem, but it hasn't!

Works most of the time, normally only does it onpaes that take a bit longer to load!

Anyway else to get this working?

Thanks

Jonathan

FMB

at the start of your script:

<?php
$begin = microtime();
$split = explode(" ", $begin);
$begin_precies = $split[0];
$begin_seconden = date("U");
$begin_tijd = $begin_precies + $begin_seconden;
?>

at the end of your script:

<?php
$einde = microtime();
$split = explode(" ", $einde);
$eind_precies = $split[0];
$eind_seconden = date("U");
$eind_tijd = $eind_precies + $eind_seconden;

$verschil = $eind_tijd - $begin_tijd;
$verschil = round($verschil,5);
echo " loading time of this page was: $verschil seconds";
?>

didn't bother translating it, except for the echo line, but you get the picture I hope 😉

jonno946

works a treat!

thanks mate 🙂

even learnt a bit of dutch in the process 😉

Jonno

dalecosp

Originally posted by jonno946
works a treat!

thanks mate 🙂

Jonno

That's handy ... did you really read the manual, though? Your original script was "example 2" ... for PHP4 you should have used "example 1" ...

<?php
// Simple function to replicate PHP 5 behaviour

function microtime_float() 
{ 
   list($usec, $sec) = explode(" ", microtime()); 
   return ((float)$usec + (float)$sec); 
} 

$time_start = microtime_float();

// Sleep for a while
usleep(100);

$time_end = microtime_float();
$time = $time_end - $time_start;

echo "Did nothing in $time seconds\n";
?>

even learnt a bit of dutch in the process 😉

That a cool thing about these boards...