TalkPHP - checking email address domains

TalkPHP (http://www.talkphp.com/forums.php)

- Absolute Beginners (http://www.talkphp.com/absolute-beginners/)

- - checking email address domains (http://www.talkphp.com/absolute-beginners/2836-checking-email-address-domains.html)

checking email address domains

currently i'm checking with this method:

$email = "godjesus@hotmail.com";
$domain = explode( "@", $email );
if(($domain[1] == "yahoo.com") || ($domain[1] == "hotmail.com")){
echo "its either yahoo or hotmail";
}

is there a better way of doing this or is this the most optimized way?

I don't know what you're after exactly. However, I would put the list of acceptable domains in an array, that way you don't have to keep adding to your if statement. I would take the following approach, using objects so that you can extend if need be, and keep it nice and tidy.

php Code:

class Validate_Email
{
    private $m_szEmail;
    private $m_szDomain;
    
    public function __construct($szEmail)
    {
        $this->m_szEmail = $szEmail;
    }
    
    public function hasValidDomain()
    {
        $aAllowedDomains = array('yahoo', 'hotmail', 'msn', 'gmail');
        preg_match('~.+?@(?P<domain>.+?)\..+~', $this->m_szEmail, $aMatches);
        
        $this->m_szDomain = $aMatches['domain'];
    
        if(!in_array($this->m_szDomain, $aAllowedDomains))
        {
            return false;
        }
        
        return true;
    }
    
    public function getDomain()
    {
        return ucfirst($this->m_szDomain);
    }
}

Then you would simply use it like so. I've put this in a loop so we can check an array of them.

php Code:

$aEmails = array('messiah@hotmail.com', 'buddha@hushmail.com', 'horus@yahoo.co.uk');

foreach ($aEmails as $szEmail)
{
    $pEmail = new Validate_Email($szEmail);
    
    if(!$pEmail->hasValidDomain())
    {
        printf('%s is an unacceptable domain.<br />', $pEmail->getDomain());
        continue;
    }
        
    printf('%s is an acceptable domain.<br />', $pEmail->getDomain());
}

if your on a linux platform you could use the checkdnsrr() function:

PHP Code:


		
			
$email = 'user@domain.com';

$domain=explode('@', $email);

if(!checkdnsrr($domain[1], 'MX')) //MX = mail exchange
{
    return false;
}

If you want to check domain availability (such as ping the host), try the fsockopen function.