Are there any specific headers that need to be set when sending PDF files via email in PHP?

When sending PDF files via email in PHP, it is important to set the appropriate headers to ensure that the file is recognized as a PDF attachment by the email client. Specifically, the "Content-Type" header should be set to "application/pdf" and the "Content-Disposition" header should be set to "attachment" to prompt the browser to download the file. 

<?php
$to = "recipient@example.com";
$subject = "PDF Attachment";
$message = "Please find the attached PDF file.";

$file = "path/to/file.pdf";
$content = file_get_contents($file);
$encoded_content = chunk_split(base64_encode($content));

$boundary = md5(time());

$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"".$boundary."\"" . "\r\n";
$headers .= "Content-Disposition: attachment; filename=\"file.pdf\"" . "\r\n";
$headers .= "--".$boundary . "\r\n";
$headers .= "Content-Type: application/pdf; name=\"file.pdf\"" . "\r\n";
$headers .= "Content-Transfer-Encoding: base64" . "\r\n";
$headers .= "Content-Disposition: attachment; filename=\"file.pdf\"" . "\r\n";
$headers .= $encoded_content . "\r\n";
$headers .= "--".$boundary."--";

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

Keywords

PHP headers PDF files email attachments

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