PHP Curl to Remove File in Bug Jquery Filer

<?php
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"https://localhost/vendor/jquery.filer/examples/dragdrop/php/ajax_remove_file.php");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
            "file=shell.php");

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$server_output = curl_exec($ch);
curl_close ($ch);
?>