Verify a User's Email Address Using PHP

Verify a User's Email Address Using PHP: "// take a given email address and split it into the �
username and domain.
list($userName, $mailDomain) = split('@', $email);
if (checkdnsrr($mailDomain, 'MX')) {
�// this is a valid email domain!
}
else {
�// this email domain doesn't exist! bad dog! no biscuit!
}"