使用php邮件多个用户

I normally mail single user on php but what I dont know if its possible to fetch all emails from the users table and bundle it in one variable ($to) and then mail it together with

mail($to, $subject, $message, $headers);

Can anyone help me with the syntax on how to mail multiple users? I am new to php and mysqli. Thanks.

PHP send mail to multiple email addresses

$recipients = array(
  "youremailaddress@yourdomain.com",
  // more emails
);

$email_to = implode(',', $recipients); // your email address
$email_subject = "Contact Form Message"; // email subject line
$thankyou = "thankyou.htm"; // thank you page

mail($email_to, $email_subject, $thankyou);

Note that you can use a custom message in place of $thankyou if you just want a standard message instead of html.