note 72327 added to function.is-numeric

Miero: Your function doesn't match some special cases: '+1', '-0', '+0', all of which are valid integers. The easiest and most reliable way to get a definite integer match is with a regular expression: function is_intval($value) { return 1 === preg_match('/^[+-]?[0-9]+$/', $value); } This has two "problems" based on your input: it matches both '00' and '999999999999999999999999999999999' as valid integers. I'm not sure why you wouldn't want to match "00". Regardless of whether somebody entered it in a form by accident or on purpose, it /is/ a valid integer, and in most instances you should accept it. The second value, "999..." is also a valid integer, even if PHPs internal int type isn't precise enough to represent it. ---- Server IP: 69.147.83.197 Probable Submitter: 74.110.130.103 ---- Manual Page -- http://www.php.net/manual/en/function.is-numeric.php Edit -- https://master.php.net/note/edit/72327 Del: integrated -- https://master.php.net/note/delete/72327/integrated Del: useless -- https://master.php.net/note/delete/72327/useless Del: bad code -- https://master.php.net/note/delete/72327/bad+code Del: spam -- https://master.php.net/note/delete/72327/spam Del: non-english -- https://master.php.net/note/delete/72327/non-english Del: in docs -- https://master.php.net/note/delete/72327/in+docs Del: other reasons-- https://master.php.net/note/delete/72327 Reject -- https://master.php.net/note/reject/72327 Search -- https://master.php.net/manage/user-notes.php