Swiftmailer：向多个收件人发送电子邮件

Question

I am trying to send email from a contact form through swiftmailer lib. My setup sends mail to a single recipient, but when I try sending to more than one email, it throws an error:

Address in mailbox given [email1@gmail.com,email2@gmail.com] does not comply with RFC 2822, 3.6.2.

but the two emails are valid according to the specification.

Here is the code;

$failed = [];
$sent = 0;
$to = [];

if (isset($_POST['recipients'])) {
    $recipients = $_POST['recipients'];
}

// Send the message
foreach ((array) $recipients as $to) {
    $message->setTo($to);
    $sent += $mailer->send($message, $failed);
}

print_r($recipients);   
printf("Sent %d messages\n", $sent);

When I sent with one email in the input field, print_r($recipients) gave me this array: (Array ( [0] => email1@gmail.com ) Sent 1 messages) before but now it's not giving the array.

I learnt that foreach expects array, but I'm not getting an array.

At one point, I was getting an error that 'recipients' is undefined; that is why I added the if isset() check.

How do I send the each email individually?

Answer 1

It looks like $_POST['recipients'] is a comma separated string. You need to use explode() to split the string on the commas. Casting it as an array won't do that for you:

// We should give $recipients a default value, in case it's empty.
// Otherwise, you would get an error when trying to use it in your foreach-loop
$recipients = [];

if(!empty($_POST['recipients'])){
    // Explode the string
    $recipients =  explode(',', $_POST['recipients']);
}      

// Send the message
foreach ($recipients as $to) {
    // To be safe, we should trim the addresses as well, removing any potential spaces. 
    $message ->setTo(trim($to));
    $sent += $mailer->send($message, $failed);
}