Make sure email field is valid?

[ffxpwns]

Hey, I have some code for an “enter email to receive a newsletter” thing. The code as is works exactly how the client wants it, but I also want to implement this email validation. Preferably the ‘advanced’ one. How would I go about doing that? The code for the emailer I already have working is below. Thank you!

[index.html]

Sign up to receive Auction notifications

And heres the emailer.php

$email = trim(strip_tags($_POST));







$subject = "Contact form submitted!";

$to = '[email protected]';



$body = <<
$message

HTML;



$headers = "From: $emailrn";

$headers .= "Content-type: text/htmlrn";





mail($to, $subject, $body, $headers);



header('Location: thanks.html');

?>

[ffxpwns]

Also, thanks.html shouldn’t matter, right?

[seanroberts]

I did not check your code. But I below is a simple check for if the email is valid. If the validation returns true the message is created and sent. Otherwise, they are sent back to the index page.

$email = trim(strip_tags($_POST));

//test if email is valid

//if it is continue, otherwise send them back to the index page

if(isValidEmail($email)){





$subject = "Contact form submitted!";

$to = '[email protected]';



$body = <<
$message

HTML;



$headers = "From: $emailrn";

$headers .= "Content-type: text/htmlrn";





mail($to, $subject, $body, $headers);



header('Location: thanks.html');

}else{



header('Location: index.html');

}



function isValidEmail($email)

{

//Perform a basic syntax-Check

//If this check fails, there's no need to continue

if(!filter_var($email, FILTER_VALIDATE_EMAIL))

{

return false;

}



//extract host

list($user, $host) = explode("@", $email);

//check, if host is accessible

if (!checkdnsrr($host, "MX") && !checkdnsrr($host, "A"))

{

return false;

}



return true;

}



?>

hope this helps

[Author]

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