Need help - PHP Email Validation w/ MX Records

Community Forums/General Help/Need help - PHP Email Validation w/ MX Records

Guy Fawkes

(Posted 2013) [#1]

Hi, all! =) I need some help with some code I did for work recently.

Basically what I need is for these 2 email validation functions to stop returning false when an email is correctly typed & validated & the email has been properly checked in the MX Records.

These are the 2 PHP functions for E-Mail Validation:

<?php
 
function isEmail( $email ) {
 
        $regexp = "^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@...})$^";
 
        if(preg_match($regexp, $email) ){
       
                $isvalid = true;
               
        }else if(!preg_match($regexp, $email)){
       
                $isvalid = false;
               
        }
       
        return $isvalid;
               
}
 
function isEmailDomainValid($email) {  
        if(isEmail($email)){
                if(checkdnsrr(array_pop(explode("@",$email)),"MX")){
                        return true;
                }else{
                        return false;
                }
        }else{
                return false;
        }
}
 
?>

This is how I check to see if an E-Mail MX record & E-Mail itself is invalid:

<?php
 
  $post = (!empty($_POST)) ? true : false;
 
  $name = trim($_POST['name']);
  $code = trim($_POST['code']);
  $email = trim($_POST['email']);
 
  if ($post) {
      if ($name == "")
          $core->msgs['name'] = 'Please enter your name';
     
      if ($code == "")
          $core->msgs['code'] = 'Please enter the total amount';
     
      if ($code != "8")
          $core->msgs['code'] = 'Entered total amount is incorrect';
     
      if ($email == ""){
          $core->msgs['email'] = 'Please enter your email address';
          }
         
          $email_check = isEmailDomainValid($email);
 
          if(!$email_check){
                 
                // Run the preg_match() function on regex against the email address
                $core->msgs['email'] = 'Entered email address is invalid!';
                         
          }
 
?>

EDIT: For some reason, the forums are weirding out my RegEx, and turning it into a link. Just so you know, I did NOT add <a href="">RegEx here</a>.

Thank You all so kindly! =)

Thundros~

Derron

(Posted 2013) [#2]

For checking EMail-addresses just use the php-build-in-functions

$email = "bibabuzzel@...";
if( filter_var($email, FILTER_VALIDATE_EMAIL) )
  print "valid email";
else
  print "invalid email";

Ok your first function:
1. You do the preg twice... no need to: if(hardwork) {} elseif{! againhardwork) {}.

I shortened and renewed your code:

function isEmail( $email ) {
        $regexp = "^([<a href=\"mailto:_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4\">_a-z0-9-]+)(\.[_a-z0-9-]+)*@...;})$^";

        return preg_match($regexp, $email);
}

function isEmailDomainValid( $email ) {  
        return ( isEmail($email) && checkdnsrr(array_pop(explode("@",$email)),"MX") );
}


function newIsEMail( $email ) {
	return filter_var($email, FILTER_VALIDATE_EMAIL);
}

function isEmailDomainValid( $email ) {  
        return ( newIsEmail($email) && checkdnsrr(array_pop(explode("@",$email)),"MX") );
}

You could even add an getmxrr(...)-call to check for all valid mx-records.

bye
Ron

edit: corrected code indention.

Derron

(Posted 2013) [#3]

Removed double posting (think you should not re-edit by alt-left,correct,submit :D)