Simple function to validate an email address.
/**
* Validate an email address.
*
* @param string $email
* @return bool Returns true if valid email address, otherwise false.
*/
function validate_email($email) {
return (!preg_match("/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix", $email)) ? false : true;
}