check function speeds

[marm]

Where could I find a web which states the speeds of php functions. I'm particularly interested in the speeds of hashes, checksums etc.

[taith]

$time=microtime();

#use function

echo 'that took '.microtime()-$time.' seconds';

[DaveEverFade]

If you can't find a webpage you can do it yourself using microtime() ie

 

$time_start = microtime(true);

//Do some stuff...

$time_end = microtime(true);
$time = $time_end - $time_start;

echo "Stuff took $time seconds";

 

(ps - this was yoinked off php.net)

[marm]

Ok, but if you those scripts, the results vary: you press "refresh" in your browser and you can get a totally different answer. And the order in which you use the functions inside those scripts also make the results vary. How can I get an "unbiased" result?

[Barand]

I usually time over 1000 iterations and get an average

[marm]

Its interesting to point out that:

 

bin2hex(mhash(MHASH_SHA1("whatever")));

 

takes nearly double the time than:

 

sha1("whatever");

 

Can other hashes be "built into php" like sha1 is?

[taith]

bin2hex(md5('adsf',TRUE)); #takes 1-2 times faster then md5 alone

[marm]

hash('md5', 'string');

 

returns: Fatal error: Call to undefined function: hash()

 

bin2hex(md5('string', TRUE));

 

returns: Warning: Wrong parameter count for md5()

 

(these errors happen in PHP4 since they were added in PHP5)