Why does the function chunk_split(base64_encode($Dateiinhalt)) need to be included in the code for sending email attachments in PHP?
When sending email attachments in PHP, the file content needs to be encoded in base64 format before being included in the email. This ensures that the file content is properly formatted for email transmission. The function chunk_split(base64_encode($Dateiinhalt)) is used to encode the file content in base64 and split it into smaller chunks for better email handling.
// Encode file content in base64 and split into smaller chunks for email attachment
$encoded_content = chunk_split(base64_encode($Dateiinhalt));
// Add the attachment to the email
$attachment = "Content-Type: application/octet-stream; name=\"filename.ext\"\r\n";
$attachment .= "Content-Transfer-Encoding: base64\r\n";
$attachment .= "Content-Disposition: attachment\r\n";
$attachment .= $encoded_content;
// Send email with attachment
// $to, $subject, $message, and $headers variables should be defined
mail($to, $subject, $message, $attachment, $headers);