How Can I Transfer Uploaded Files to Another Server Using cURL in PHP?

Transferring Uploaded Files Using cURL in PHP

You have a web form with a file upload button and an accompanying PHP script that processes the uploaded file. However, you now need to forward the file to another server. This article provides a solution to accomplish this task.

To upload the file, you can utilize cURL with the following steps:

<?php
if (function_exists('curl_file_create')) { // php 5.5+
  $cFile = curl_file_create($file_name_with_full_path);
} else { // 
  $cFile = '@' . realpath($file_name_with_full_path);
}
$post = array('extra_info' => '123456','file_contents' => $cFile);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$target_url);
curl_setopt($ch, CURLOPT_POST,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
$result=curl_exec ($ch);
curl_close ($ch);
?>

For additional information, you may also refer to:

https://blog.derakkilgo.com/2009/06/07/send-a-file-via-post-with-curl-and-php/

Note for PHP 5.5 :

For this version of PHP, you should use https://wiki.php.net/rfc/curl-file-upload instead. However, if you still want to follow the deprecated approach described above, ensure to set curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false); in your script.

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