PHP method to implement FTP file transfer based on curl

<?php
function upload($dir,$src,$dest)
{
  $ch = curl_init();
  $fp = fopen($src, &#39;r&#39;);
  curl_setopt($ch, CURLOPT_URL, &#39;ftp://user:pwd@host/interpretation/&#39;.$dir .&#39;/&#39;. $dest);
  curl_setopt($ch, CURLOPT_UPLOAD, 1);
  curl_setopt($ch, CURLOPT_INFILE, $fp);
  curl_setopt($ch, CURLOPT_INFILESIZE, filesize($src));
  curl_exec ($ch);
  $error_no = curl_errno($ch);
  curl_close ($ch);
  if ($error_no != 0)
  {
     return 0;
  }else{
   return 1;
  }
} 
upload("images","s.py","aaa.py");
?>