How Can I Upload Files Using PHP and cURL?

Uploading Files using PHP and cURL

This question explores how to upload files using PHP, specifically using cURL. The user posts a file through a form to a PHP script, which then needs to forward it to another script. The PHP code provided for receiving and uploading the file is as follows:

echo"".$_FILES['userfile']."";
$uploaddir = './';
$uploadfile = $uploaddir . basename($_FILES['userfile']['name']);
if ( isset($_FILES["userfile"]) ) {
  echo '<p><font color=&quot;#00FF00&quot; size=&quot;7&quot;>Uploaded</font></p>';
  if (move_uploaded_file
($_FILES[&quot;userfile&quot;][&quot;tmp_name&quot;], $uploadfile))
echo $uploadfile;
else echo '<p><font color=&quot;#FF0000&quot; size=&quot;7&quot;>Failed</font></p>';
}

To send the file to the receiver server using cURL:

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);

Additional Resources:

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

Note for PHP 5.5 :

In PHP 5.5 , it's recommended to use the newer curl_file_upload RFC for file uploads. However, if using the deprecated approach, ensure curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false); is set.

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