note 118121 added to function.ctype-digit

Please note that ctype_digit() will say true for strings such as '00001', which are not technically valid representations of integers, while saying false to strings such as '-1', which are. It's basically a faster version of the regex /^\d+$/. As the name says, it answers the question "does this string contain only digits" literally. It does not answer "is this a valid representation of an integer". If that's what you want, use is_int(filter_var($val, FILTER_VALIDATE_INT)) instead. ---- Server IP: 213.172.110.13 Probable Submitter: 217.160.127.250 ---- Manual Page -- http://php.net/manual/en/function.ctype-digit.php Edit -- https://master.php.net/note/edit/118121 Del: integrated -- https://master.php.net/note/delete/118121/integrated Del: useless -- https://master.php.net/note/delete/118121/useless Del: bad code -- https://master.php.net/note/delete/118121/bad+code Del: spam -- https://master.php.net/note/delete/118121/spam Del: non-english -- https://master.php.net/note/delete/118121/non-english Del: in docs -- https://master.php.net/note/delete/118121/in+docs Del: other reasons-- https://master.php.net/note/delete/118121 Reject -- https://master.php.net/note/reject/118121 Search -- https://master.php.net/manage/user-notes.php