note 83118 added to function.is-int

To check if a string ($s) is a representation of an integer (including representations is scientific notation and negative numbers), you can use the following test, provided that you don't expect values that are out of bounds for an integer. is_numeric($s) && floatval($s) == intval(floatval($s)) If the test returns true, the string is a representation of an integer. is_numeric (if it works as intended) protects from strings that are not proper numbers. The comparison filters anything that is non_integer If, for performance reasons, you want to avoid converting to float twice, it can also be written: is_numeric($s) && ($f = floatval($s)) == intval($f) If you plan to get values that cannot be representated with an integer and are ready to deal with a float, you can use floor instead of intval, as long as you are ready to deal with floats. Even so, that method will become unreliable when the precision of the float becomes insufficient for getting to the fractional part of the number ---- Server IP: 128.39.198.38 Probable Submitter: 80.203.37.140 ---- Manual Page -- http://www.php.net/manual/en/function.is-int.php Edit -- https://master.php.net/note/edit/83118 Del: integrated -- https://master.php.net/note/delete/83118/integrated Del: useless -- https://master.php.net/note/delete/83118/useless Del: bad code -- https://master.php.net/note/delete/83118/bad+code Del: spam -- https://master.php.net/note/delete/83118/spam Del: non-english -- https://master.php.net/note/delete/83118/non-english Del: in docs -- https://master.php.net/note/delete/83118/in+docs Del: other reasons-- https://master.php.net/note/delete/83118 Reject -- https://master.php.net/note/reject/83118 Search -- https://master.php.net/manage/user-notes.php