PHP send batch email [closed]

Posted by qalbiol on Stack Overflow See other posts from Stack Overflow or by qalbiol
Published on 2012-09-02T16:19:51Z Indexed on 2012/09/05 9:38 UTC
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Sending mass email using PHP

I have a PHP script that sends an individual email to all users in my DB, such as a monthly / weekly newsletter.

The code I am using goes as follows:

$subject = $_POST['subject'];
$message = $_POST['message'];

// Get all the mailing list subscribers.
$query = $db->prepare("SELECT * FROM maildb");
$query->execute();

// Loop through all susbcribers, and send and individual email.
foreach ($query as $row) {

    // Setting maximum time limit to infinite.
    set_time_limit(0);

    $newMessage = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
        <html xmlns="http://www.w3.org/1999/xhtml">
        <head>
        </head>
        <body>';

    // Search for the [unsubscribe] tag and replace it with a URL for the user to unsubscribe
    $newMessage .= str_replace("[unsubscribe]", "<a href='".BASE_URL."unsubscribe/".$row['hash']."/".$row['email']."'>unsubscribe</a>", $message);

    $newMessage .= '</body></html>';

    $to = $row['email'];

    // Establish content headers
    $headers = "From: [email protected]"."\n";
    $headers .= "Reply-To: [email protected]"."\n";
    $headers .= "X-Mailer: PHP v.". phpversion()."\n";
    $headers .= "MIME-Version: 1.0"."\n";  
    $headers .= "Content-Type: text/html; charset=iso-8859-1"."\n";
    $headers .= "Content-Transfer-Encoding: 8bit;";

    mail($to, $subject, $newMessage, $headers); // Send email to each individual user

}

This code works perfectly with a REALLY small database... I recently populated my test db with 200k+ users, and obviously this script fails, gets out of memory, and dies...

I know this is a bad way to send so many emails, thats why I'd like to ask you for much more efficient ways to do this!

Thank you very much!

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