How can PHP be used to include a banner in an email message?

To include a banner in an email message using PHP, you can use the PHP `mail()` function to send an HTML email with the banner image included as an attachment or embedded directly in the email body. You can also use PHP to dynamically generate the HTML code for the email message, including the banner image.

<?php
$to = 'recipient@example.com';
$subject = 'Welcome!';
$message = '
<html>
<head>
<title>Welcome</title>
</head>
<body>
<p>Welcome to our website!</p>
<img src="https://example.com/banner.jpg" alt="Banner Image">
</body>
</html>
';

$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

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