note 123455 added to function.is-numeric

intval() appears to be helpful with hex strings: <?php // is_hex_numeric.php /** * PHP 7.0.0+ Strings in hexadecimal (e.g. 0xf4c3b00c) notation * are no longer regarded as numeric strings, i.e. is_numeric() returns FALSE now. * See: http://php.net/manual/en/function.intval.php */ error_reporting(E_ALL); var_dump( PHP_VERSION ); // string(6) "7.1.25" var_dump( PHP_INT_SIZE ); // int(8) $x = 0xf4c3b00c; // --> Assignment of hex value var_dump($x); // int(4106465292) var_dump( is_numeric($x) ); // bool(true) $y = '0x' . dechex($x); // --> Convert hex value to a string var_dump($y); // string(10) "0xf4c3b00c" var_dump( is_numeric($y) ); // bool(false) $z = intval($y, 0); // --> intval() with base zero recognizes hex notation var_dump($z); // int(4106465292) var_dump( is_numeric($z) ); // bool(true) var_dump($x == $z); // bool(true) ---- Server IP: 208.43.231.9 Probable Submitter: 2600:8806:6400:36:8943:f0be:c00d:86ab ---- Manual Page -- http://php.net/manual/en/function.is-numeric.php Edit -- https://master.php.net/note/edit/123455 Del: integrated -- https://master.php.net/note/delete/123455/integrated Del: useless -- https://master.php.net/note/delete/123455/useless Del: bad code -- https://master.php.net/note/delete/123455/bad+code Del: spam -- https://master.php.net/note/delete/123455/spam Del: non-english -- https://master.php.net/note/delete/123455/non-english Del: in docs -- https://master.php.net/note/delete/123455/in+docs Del: other reasons-- https://master.php.net/note/delete/123455 Reject -- https://master.php.net/note/reject/123455 Search -- https://master.php.net/manage/user-notes.php