PHP CURLFile: Using 'php://mem' and Memory-Based Files

The code 'php://mem' is not a valid file path for the PHP 'CURLFile' class.

The 'CURLFile' class is used to create a file object that can be sent with a cURL request. It requires a valid file path as its parameter, not a stream wrapper like 'php://mem'.

If you want to send a file that is stored in memory, you can use the 'CURLOPT_POSTFIELDS' option in cURL to send the file contents as a string. Here's an example:

$fileContents = 'This is the contents of the file';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com/upload.php');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, ['file' => $fileContents]);
curl_exec($ch);
curl_close($ch);

In the example above, the file contents are stored in the '$fileContents' variable, and then passed as a parameter to the 'CURLOPT_POSTFIELDS' option. The server-side script at 'http://example.com/upload.php' can then access the file contents using '$_POST['file']'.