transfer file using file get content

1file_get_contents('http://url/to/upload/handler', false, $context);

1$filename = "/path/to/uploaded/file.zip";
2$file_contents = file_get_contents($filename);    
3
4$content =  "--".MULTIPART_BOUNDARY."\r\n".
5            "Content-Disposition: form-data; name=\"".FORM_FIELD."\"; filename=\"".basename($filename)."\"\r\n".
6            "Content-Type: application/zip\r\n\r\n".
7            $file_contents."\r\n";
8
9// add some POST fields to the request too: $_POST['foo'] = 'bar'
10$content .= "--".MULTIPART_BOUNDARY."\r\n".
11            "Content-Disposition: form-data; name=\"foo\"\r\n\r\n".
12            "bar\r\n";
13
14// signal end of request (note the trailing "--")
15$content .= "--".MULTIPART_BOUNDARY."--\r\n";

1$header = 'Content-Type: multipart/form-data; boundary='.MULTIPART_BOUNDARY;