How to send attachment by swift in php?

How do I send an email with an attachment using PHP?

• I would rather learn the actual code, rather than using pre-made scripts/classes. I'm already farmiliar with sending plain-text emails and adding some headers (from, reply-to etc) Im using PHP 4.1

• Answer:

  So why don't you learn the actual code by looking at pre-made scripts/classes? It's not like it comes obfuscated or encoded... Get a copy of, say, phpMailer: http://phpmailer.sf.net/ and reverse-engineer your heart out... Generally speaking, sending e-mail with attachments requires the use of encoding (the most commonly used method is base64encode, but some applications still use UUencode) and the "Content-Type: multipart/mixed" header. You use the header to indicate that the message has attachments and to indicate the boundary (a sequence of symbols delimiting the parts). Each part, in turn, is a complete MIME message with its own "Content-Type:" header; the bodies of the parts that are binary should be encoded (so such a part will have a "Content-Transfer-Encoding:" header)...