Posting images via CURL to a form - php

Question

I've had a tough time trying to find a solution for the following problem, I need to use curl to submit a form on a website, however it also needs to upload a picture its a normal input file field
<input type="file" name="image"/>
I have a class and the curl function is defined like this
function fetch($url, $username='', $data='', $proxy=''){
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, true);
if(isset($proxy)) {
curl_setopt($ch,CURLOPT_TIMEOUT,30);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_PROXYPORT, $proxy);
curl_setopt($ch, CURLOPT_PROXYUSERPWD, 'proxyadmin:parola');
}
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FRESH_CONNECT,true);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/3.0 (compatible; MSIE 6.0; Windows NT 5.0)");
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
if($username) {
curl_setopt($ch, CURLOPT_COOKIEFILE, "cookie/{$username}.txt");
curl_setopt($ch, CURLOPT_COOKIEJAR, "cookie/{$username}.txt");
}
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
if (is_array($data) && count($data)>0){
curl_setopt($ch, CURLOPT_POST, true);
$params = http_build_query($data);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
}
if (is_array($this->headers) && count($this->headers)>0){
curl_setopt($ch, CURLOPT_HTTPHEADER, $this->headers);
}
$this->result = curl_exec($ch);
$curl_info = curl_getinfo($ch);
$header_size = $curl_info["header_size"];
$this->headers = substr($this->result, 0, $header_size);
$this->http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$this->error = curl_error($ch);
curl_close($ch);
}
Anyone could help me? very lost

Answer 1

If you change the following block of code:
// from
if (is_array($data) && count($data)>0){
curl_setopt($ch, CURLOPT_POST, true);
$params = http_build_query($data);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
}
// to
if (is_array($data) && count($data)>0) {
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
}
And to have it post the file uploaded by the user, set up your data array like this:
// make sure $_FILES['file'] has been uploaded and is valid
$data = array('field' => 'value',
'name' => 'test',
'email' => 'something',
'file' => '#' . $_FILES['file']['tmp_name']
);
fetch($url, $username, $data);
That will tell curl to send a form post with a file upload. By setting the post fields to an array and prepending an & to the full path of a file that is a value of the array, curl will send an multipart/form-data post request with your file upload.
See curl file upload example