php check if any of many characters are in one long string?

[unwashed potato!]

i've got a tracking script which is working well enough to show visitors, however the bots are messing up the results.

at the moment i've got a list of what i don't want from the user agent and do a strpos for each one such as

$findme1 = 'bot';
$findme2 = 'spider';
$pos1 = strpos($mystring, $findme1);
$pos2 = strpos($mystring, $findme2);
if ($pos1 === false && $pos2 === false) {
update tracking
}

however this i know this is no good for doing many times. it's now at 10 checks so i would like a quicker way but unsure how.

thanks

 

[unwashed potato!]

Edit

Perhaps you could approach the problem with a different solution.

open to a new solution but can't think how else i could do it. i simply want to say if bot, spider, crawler, splurp, yandex and many more are found any where hidden in the user agent then don't insert.