添付メール送る奴 php 5.1.6で動作確認

example.php

<?php

require "path/to/mail.php";
echo send_mail("[email protected]", "[email protected]", "subject", "message", "path/to/file.format");

mail.php

<?php
// 参考
// http://www.shotdev.com/php/php-mail/php-send-email-upload-form-attachment-file/

function send_mail($to, $from, $subject, $body, $path = "") {
  $random_hash = md5(date('r', time()));
  $rn = "\r\n";
  $filename = basename($path);

  // header
  $headers = "From: $from <$from>$rn";
  $headers .= "MIME-Version: 1.0$rn";
  $headers .= "Content-Type: multipart/mixed; boundary=\"$random_hash\"$rn$rn";
  $headers .= "This is a multi-part message in MIME format.$rn";

  // body
  $headers .= "--$random_hash$rn";
  $headers .= "Content-Type: text/html; charset=utf-8$rn";  
  $headers .= "Content-Transfer-Encoding: 7bit$rn$rn";
  $headers .= "$body$rn$rn";

  // attachment
  if (!empty($path)) {
    $headers .= "--$random_hash$rn";
    $headers .= "Content-Type: application/octet-stream; name=\"$filename\"$rn";
    $headers .= "Content-Transfer-Encoding: base64$rn";
    $headers .= "Content-Dispositon: attachment \"$filename\"$rn$rn";
    $attachment = chunk_split(base64_encode(file_get_contents($path))); 
    $headers .= "$attachment$rn$rn";
  }

  return mail($to, $subject, null, $headers);
}