What best practices should be followed when handling multiple email recipients based on user input in PHP?

When handling multiple email recipients based on user input in PHP, it is important to sanitize and validate the input to prevent any potential security risks such as injection attacks. Additionally, loop through the list of recipients and send individual emails to each recipient to ensure that each email address receives the intended message. 

// Sanitize and validate the user input for email recipients
$recipients = filter_var_array($_POST['recipients'], FILTER_VALIDATE_EMAIL);

// Loop through the list of recipients and send individual emails
foreach ($recipients as $recipient) {
    $to = $recipient;
    $subject = "Your Subject Here";
    $message = "Your Message Here";
    $headers = "From: your_email@example.com";

    // Send the email
    mail($to, $subject, $message, $headers);
}

Keywords

PHP email handling multiple recipients user input validation

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