CP Blogs

check email/username for FEU

Sometimes, when building a user based site, we need to check if a username is already created. Using the auto generated usernames for FEU sort of solves this but will not protect from a user just making tons of accounts. So I lick to take it to the next level. Here is a simple way to check of full uniqueness.

In this example $_GET['cntnt01fbrp__39'] is an ajax call from formbuilder... You would/could change the get to email or something. This also suggest some valid alternates... ie: if you are not using an email for the user name then you would want to give the alternates...

So this uses checkdnsrr to realy keep down the spam and false leads down to a min. checkdnsrr() checks DNS records corresponding to a given Internet host name or IP address.

 global $gCms; $FEU = $gCms->modules['FrontEndUsers']['object']; // A FUNCTION TO TEST FOR A VALID EMAIL ADDRESS, RETURN TRUE OR FALSE function check_valid_email($email){ // IS THE PATTERN OF THE EMAIL ADDRESS OK? if (!preg_match('/^[A-Z0-9_-][A-Z0-9._-]*@([A-Z0-9][A-Z0-9-]*\.)+[A-Z]{2,6}$/i', $email)) return FALSE; // IS THE DOMAIN OF THE EMAIL ADDRESS ROUTABLE OVER THE INTERNET FOR MX OR A RECORDS? $emaila = explode('@', $email); if ( checkdnsrr($emaila[1],"MX") || checkdnsrr($emaila[1],"A") ) return TRUE; // NOT ROUTABLE return FALSE; } if (!empty($_GET['cntnt01fbrp__39'])){ $e = $_GET['cntnt01fbrp__39']; if (check_valid_email($e)){ echo "<br/>VALID: $e \n"; if($FEU->GetUserID($e)){ $e1=$e; while ($FEU->GetUserID($e1)) { $e1=$e.rand(5, 100); } $e2=$e.rand(5, 100); while ($FEU->GetUserID($e2)) { $e2=$e.rand(5, 100); } echo '<span style="color:red">This is not available</span> <span style="color:green">'.$e1.' and '.$e2.' is available</span>'; return 'false'; }else{ echo "<br/>AVAILABLE: $e \n"; return 'true'; } }else{ echo "<br/>BOGUS: $e \n"; return 'false'; } } 

Hope this helps
Cheers

jeremyBass