note 55315 deleted from function.stristr by danbrown

Note Submitter: trojjer ---- Regarding previous entry about validation: "Note: If you only want to determine if a particular needle occurs within haystack, use the faster and less memory intensive function strpos() instead." You have to use strpos('haystack','needle')!==false though, of course, incase it returns zero as the actual position, like it says on that page.