note 72327 deleted from function.is-numeric by cmb

Note Submitter: meagar at gmail dot com ---- 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.