note 116247 added to function.preg-replace

"preg_replace" is able to be exploited with a DOS attack by the user submitting a very long string. One way I combat this is by using "substr" first to grab the first part of the string. $input_string = $_GET['user_input']; // If necessary you can log any user attempts to submit a long string $string_length = strlen($input_string); if($string_lenght > 100){log_func($_SERVER['REMOTE_ADDR'], $string_length, $input_string);} $input_string_cut = substr($input_string,0,100); $string = preg_replace('/[^a-zA-Z0-9]/', '', $input_string_cut); echo($string); ---- Server IP: 72.52.91.14 Probable Submitter: 174.102.161.183 ---- Manual Page -- http://php.net/manual/en/function.preg-replace.php Edit -- https://master.php.net/note/edit/116247 Del: integrated -- https://master.php.net/note/delete/116247/integrated Del: useless -- https://master.php.net/note/delete/116247/useless Del: bad code -- https://master.php.net/note/delete/116247/bad+code Del: spam -- https://master.php.net/note/delete/116247/spam Del: non-english -- https://master.php.net/note/delete/116247/non-english Del: in docs -- https://master.php.net/note/delete/116247/in+docs Del: other reasons-- https://master.php.net/note/delete/116247 Reject -- https://master.php.net/note/reject/116247 Search -- https://master.php.net/manage/user-notes.php