How can MIME-Version and Content-Type headers be properly set for email attachments in PHP?

When sending email attachments in PHP, it is important to set the MIME-Version and Content-Type headers correctly to ensure that the email client can interpret the attachment properly. The MIME-Version header specifies the MIME version being used (typically 1.0), while the Content-Type header specifies the type of content being sent (e.g. application/pdf for a PDF attachment). These headers should be included in the email headers when sending an email with attachments in PHP. 

// Set MIME-Version and Content-Type headers for email attachments
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"boundary_text\"" . "\r\n";

// Define boundary for separating different parts of the email
$boundary = "--boundary_text";

// Attach the file to the email
$attachment = chunk_split(base64_encode(file_get_contents('path/to/attachment.pdf')));

// Build the email message with attachment
$message = $boundary . "\r\n";
$message .= "Content-Type: application/pdf; name=\"attachment.pdf\"" . "\r\n";
$message .= "Content-Transfer-Encoding: base64" . "\r\n";
$message .= "Content-Disposition: attachment; filename=\"attachment.pdf\"" . "\r\n\r\n";
$message .= $attachment . "\r\n";
$message .= $boundary . "--";

// Send the email with attachment
mail('recipient@example.com', 'Subject', $message, $headers);

Keywords

MIME-Version Content-Type email attachments PHP headers

Related Questions