PHP validate email addresses separated by a comma

Question

a have a PHP Mail function which sends emails to addresses from a MySQL Database.

In the database, the email addresses are separated by a comma when there are multiple.

i have tried using:

if(filter_var($email_to, FILTER_VALIDATE_EMAIL))

but this only works for one email address, how can i validate multiple separated by a comma?

like:

[email protected],[email protected]

here is my email function:

require_once "/usr/local/lib/php/Mail.php";

            $from = $email_from;
            $to = $email_to;
            $subject = $email_subject;
            $body = $email_body;

            $host = "mail.domain.co.uk";
            $username = "[email protected]";
            $password = "*********";

            $headers = array ('From' => $from,
              'To' => $to,
              'Cc' => $cc,
              'Subject' => $subject,
              'Content-type' => 'text/html');
            $smtp = Mail::factory('smtp',
              array ('host' => $host,
             'auth' => true,
             'username' => $username,
             'password' => $password));

             $rec = $to.', '.$cc;

            $mail = $smtp->send($rec, $headers, $body);

how can i validate the comma separated values in the $to and $cc?

Answer 1

Try this:

foreach(explode(',', $sEmailAddresses) AS $sEmailAddress) {
   $bValid |= filter_var($sEmailAddress, FILTER_VALIDATE_EMAIL);
}

$sResult = ($bValid) ? 'Both are valid' : 'One of them are not';

Answer 2

function:

function getValidEmails($email_list) {
    $valid_emails = array();
    if (-1 !== strpos($email_list, ',')) {
        $email_list = explode(',', $email_list);
        array_walk_recursive($email_list, function(&$email) {
            $email = filter_var(trim($email), FILTER_VALIDATE_EMAIL);
            if (false !== $email) {
                $valid_emails[] = $email;
            }
        });
    } else {
        $email = filter_var(trim($email_list), FILTER_VALIDATE_EMAIL);
        if (false !== $email) {
            $valid_emails[] = $email;
        }
    }
    return $valid_emails;
}

usage:

$valid_emails = getValidEmails('[email protected],bbb@bbb,[email protected]');
if (sizeof($valid_emails))
{
    $to      = implode(',', $valid_emails);
    $subject = 'the subject';
    $message = 'hello';
    $headers = 'From: [email protected]' . "\r\n" .
        'Reply-To: [email protected]' . "\r\n" .
        'X-Mailer: PHP/' . phpversion() ."\r\n" .
        'MIME-Version: 1.0' . "\r\n" .
        'Content-type: text/html; charset=iso-8859-1' . "\r\n";

    mail($to, $subject, $message, $headers);
}
else {
    // validation failed for email list
}

this function will work with single email as well as many, separated by comma.