Something like this perhaps? First you create a search that will match all the events you're interested in. Then in your chart command you either split by get_request...
source=src get_request=*foo.php* OR get_request=*bar.php* OR get_request=*fuzz.php* | chart count by get_request
...or if there are a lot of different URL's that share similar filenames and you just want the stats by the filenames instead of all different URL's, split up your stats by matching on the different specific filenames you mention.
source=src get_request=*foo.php* OR get_request=*bar.php* OR get_request=*fuzz.php* | chart count(eval(match(get_request,"foo.php"))), count(eval(match(get_request,"bar.php"))), count(eval(match(get_request,"fuzz.php")))
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