note 80363 added to function.strpos

WARNING As strpos may return either FALSE (substring absent) or 0 (substring at start of string), strict versus loose equivalency operators must be used very carefully. To know that a substring is absent, you must use: === FALSE To know that a substring is present (in any position including 0), you can use either of: !== FALSE (recommended) > -1 (note: or greater than any negative number) To know that a substring is at the start of the string, you must use: === 0 To know that a substring is in any position other than the start, you can use any of: > 0 (recommended) != 0 (note: but not !== 0 which also equates to FALSE) != FALSE (disrecommended as highly confusing) Also note that you cannot compare a value of "" to the returned value of strpos. With a loose equivalence operator (== or !=) it will return results which don't distinguish between the substring's presence versus position. With a strict equivalence operator (=== or !==) it will always return false. ---- Server IP: 64.71.164.2 Probable Submitter: 76.201.168.43 ---- Manual Page -- http://www.php.net/manual/en/function.strpos.php Edit -- https://master.php.net/note/edit/80363 Del: integrated -- https://master.php.net/note/delete/80363/integrated Del: useless -- https://master.php.net/note/delete/80363/useless Del: bad code -- https://master.php.net/note/delete/80363/bad+code Del: spam -- https://master.php.net/note/delete/80363/spam Del: non-english -- https://master.php.net/note/delete/80363/non-english Del: in docs -- https://master.php.net/note/delete/80363/in+docs Del: other reasons-- https://master.php.net/note/delete/80363 Reject -- https://master.php.net/note/reject/80363 Search -- https://master.php.net/manage/user-notes.php