方法是从数据库中检索数据，并用每个循环发送一封新的电子邮件。请注意，有些寄宿者要求电子邮件之间有几毫秒的间隔。
举个例子：

<?php
$pdo = new PDO('mysql:host=localhost;dbname=mydb', 'root', '');
$sql = "SELECT email FROM users";

    foreach ($pdo->query($sql) as $row) {
        $mail = new PHPMailer\PHPMailer\PHPMailer();
        $mail->IsSMTP(); // enable SMTP
        $mail->SMTPDebug = 0; // debugging: 1 = errors and messages, 2 = messages only, 0 = nothing
        $mail->CharSet = "UTF-8";
        $mail->SMTPAuth = true; // authentication enabled
        $mail->SMTPSecure = 'ssl'; // secure transfer enabled REQUIRED for Gmail
        $mail->Host = 'your_email_host';
        $mail->Port = 465; // or 587
        $mail->IsHTML(true);
        $mail->Username = 'your_emailaccount_username';
        $mail->Password = 'your_emailaccount_password';
        $mail->SetFrom('from@example.com', 'from_name');
        $mail->Subject = 'Your Email Subject';
        $mail->Body = $body_combined;
        $mail->AddAddress($row['email']); // dynamic email from DB with every loop
    }