What are best practices for sending bulk emails using PHP and a database?

Sending bulk emails using PHP and a database can be efficiently done by batching the emails in smaller groups to prevent server overload and ensuring proper email deliverability. It's important to use a library like PHPMailer to handle the email sending process and to properly sanitize and validate email addresses before sending. 

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Select all email addresses from the database
$sql = "SELECT email FROM users";
$result = $conn->query($sql);

// Loop through the results and send emails in batches
$batchSize = 100;
$batch = array();
while ($row = $result->fetch_assoc()) {
    $batch[] = $row['email'];
    if (count($batch) == $batchSize) {
        // Send emails in this batch
        foreach ($batch as $email) {
            // Use PHPMailer to send email
            // Make sure to properly sanitize and validate $email
        }
        $batch = array(); // Reset batch
    }
}

// Send any remaining emails in the last batch
foreach ($batch as $email) {
    // Use PHPMailer to send email
    // Make sure to properly sanitize and validate $email
}

// Close the database connection
$conn->close();

Keywords

PHP bulk emails database SMTP mailer

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