Send File to HTTPS URL using CURL and PHP

I am attempting to send a file to an Https URL with this code:

$file_to_upload = array('file_contents'=>'@'.$target_path); 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $target_url); 
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSER, FALSE);
curl_setopt($ch, CURLOPT_UPLOAD, TRUE);
curl_setopt($ch, CURLOPT_POST,1); 
curl_setopt($ch, CURLOPT_POSTFIELDS, 'file='.$file_to_upload); 
$result = curl_exec($ch); 
$error = curl_error($ch);
curl_close ($ch); 
echo " Server response: ".$result; 
echo " Curl Error: ".$error;

But for some reason I'm getting this response:

Curl Error: Failed to open/read local data from file/application

Any advice would help thanks!

UPDATE: When I take out CURLOPT_UPLOAD, I get a response from the targe开发者_C百科t server but it says that there was no file in the payload

You're passing a rather strange argument to CURLOPT_POSTFIELDS. Try something more like:

<?
$postfields = array('file' => '@' . $target_path);
// ...
curl_setopt($ch, CURLOPT_POSTFIELDS, $postfields);
?>

Also, you probably want CURLOPT_RETURNTRANSFER to be true, otherwise $result won't get the output, it'll instead be sent directly to the buffer/browser.

This example from php.net might be of use as well:

<?php

$ch = curl_init();

$data = array('name' => 'Foo', 'file' => '@/home/user/test.png');

curl_setopt($ch, CURLOPT_URL, 'http://localhost/upload.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

curl_exec($ch);
?>

On top of coreward's answer:

According to how to upload file using curl with php, starting from php 5.5 you need to use curl_file_create($path) instead of "@$path".

Tested: it does work.

With the @ way no file gets uploaded.