note 51977 added to function.preg-split

Here is a way to make sure the user only has valid characters in a string... Useful for validating usernames... <?php function blow_up($str){ return preg_split("//", $str, -1, PREG_SPLIT_NO_EMPTY); } $userstr= "the jahn!"; $user= blow_up(strtolower($userstr)); $valchars= "abcdefghijklmnopqrstuvwxyz0123456789"; $valchars= blow_up($valchars); $inval= ''; for($i=0;$i<count($user);$i++){ if(!in_array($user[$i], $valchars)){ $inval= $inval.$user[$i]; } } if(strlen($inval)>0){ echo 'System found '.strlen($inval).' invalid characters.<br>'; echo $inval; }else{ echo 'No invalid characters detected...'; } ?> ---- Manual Page -- http://www.php.net/manual/en/function.preg-split.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+51977 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+51977&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+51977&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+51977&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+51977&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+51977&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+51977&report=yes Search -- http://master.php.net/manage/user-notes.php