note 104160 added to function.filter-var

FILTER_VALIDATE_URL does not support internationalized domain name (IDN). Valid or not, no domain name with Unicode chars on it will pass validation. We can circumvent this with a home grown solutions, but C code is C code, so I've gone for the code bellow, which builds on filter_var(). <?php $res = filter_var ($uri, FILTER_VALIDATE_URL); if ($res) return $res; // Check if it has unicode chars. $l = mb_strlen ($uri); if ($l !== strlen ($uri)) { // Replace wide chars by “X”. $s = str_repeat (' ', $l); for ($i = 0; $i < $l; ++$i) { $ch = mb_substr ($uri, $i, 1); $s [$i] = strlen ($ch) > 1 ? 'X' : $ch; } // Re-check now. $res = filter_var ($s, FILTER_VALIDATE_URL); if ($res) { $uri = $res; return 1; } } ?> The logic is simple. A non-ascii char is more than one byte long. We replace every one of those chars by "X" and check again. An alternative will be to punycode the URI before calling filter_var(), but PHP lacks native support for punycode. I think my approach is effective. Please e-mail me if you think otherwise or see room for improvement. ---- Server IP: 81.92.192.129 Probable Submitter: 95.92.92.137 ---- Manual Page -- http://www.php.net/manual/en/function.filter-var.php Edit -- https://master.php.net/note/edit/104160 Del: integrated -- https://master.php.net/note/delete/104160/integrated Del: useless -- https://master.php.net/note/delete/104160/useless Del: bad code -- https://master.php.net/note/delete/104160/bad+code Del: spam -- https://master.php.net/note/delete/104160/spam Del: non-english -- https://master.php.net/note/delete/104160/non-english Del: in docs -- https://master.php.net/note/delete/104160/in+docs Del: other reasons-- https://master.php.net/note/delete/104160 Reject -- https://master.php.net/note/reject/104160 Search -- https://master.php.net/manage/user-notes.php