How can multiple emails be sent using PHP, and what are the best practices for handling email validation and copying?

To send multiple emails using PHP, you can loop through an array of email addresses and use the `mail()` function to send each email individually. When handling email validation, it's best to use PHP's built-in `filter_var()` function with the `FILTER_VALIDATE_EMAIL` filter to ensure the email addresses are valid. When copying emails, you can use the `CC` or `BCC` headers in the `mail()` function to send copies of the email to additional recipients. 

<?php
// Array of email addresses
$emails = ['recipient1@example.com', 'recipient2@example.com', 'recipient3@example.com'];

// Loop through each email address and send email
foreach ($emails as $email) {
    // Validate email address
    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
        // Send email
        $to = $email;
        $subject = 'Subject';
        $message = 'Message body';
        $headers = 'From: sender@example.com' . "\r\n" .
                   'CC: cc@example.com' . "\r\n"; // Copy to cc@example.com
        mail($to, $subject, $message, $headers);
        echo 'Email sent to ' . $email . '<br>';
    } else {
        echo 'Invalid email address: ' . $email . '<br>';
    }
}
?>

Keywords

PHP multiple emails email validation email copying best practices

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