note 77905 added to function.ord

The following uniord function is simpler and more efficient than any of the ones suggested without depending on mbstring or iconv. It's also more validating (code points above U+10FFFF are invalid; sequences starting with 0xC0 and 0xC1 are invalid overlong encodings of characters below U+0080), though not entirely validating, so it still assumes proper input. <?php function uniord($c) { $h = ord($c{0}); if ($h <= 0x7F) { return $h; } else if ($h < 0xC2) { return false; } else if ($h <= 0xDF) { return ($h & 0x1F) << 6 | (ord($c{1}) & 0x3F); } else if ($h <= 0xEF) { return ($h & 0x0F) << 12 | (ord($c{1}) & 0x3F) << 6 | (ord($c{2}) & 0x3F); } else if ($h <= 0xF4) { return ($h & 0x0F) << 18 | (ord($c{1}) & 0x3F) << 12 | (ord($c{2}) & 0x3F) << 6 | (ord($c{3}) & 0x3F); } else { return false; } } ?> If you want a fully validating function, you'll need to check the extra octets are between 0x80 and 0xBF, and there are no overlong encodings (characters below a certain point in n-octet sequences). ---- Server IP: 80.64.47.13 Probable Submitter: 217.125.117.197 ---- Manual Page -- http://www.php.net/manual/en/function.ord.php Edit -- https://master.php.net/note/edit/77905 Del: integrated -- https://master.php.net/note/delete/77905/integrated Del: useless -- https://master.php.net/note/delete/77905/useless Del: bad code -- https://master.php.net/note/delete/77905/bad+code Del: spam -- https://master.php.net/note/delete/77905/spam Del: non-english -- https://master.php.net/note/delete/77905/non-english Del: in docs -- https://master.php.net/note/delete/77905/in+docs Del: other reasons-- https://master.php.net/note/delete/77905 Reject -- https://master.php.net/note/reject/77905 Search -- https://master.php.net/manage/user-notes.php