<?php

var_dump(ini_set('open_basedir', '/tmp'));

$ch = curl_init();
var_dump(curl_setopt($ch, CURLOPT_COOKIEFILE, ""));
var_dump(curl_setopt($ch, CURLOPT_COOKIEFILE, "/tmp/foo"));
var_dump(curl_setopt($ch, CURLOPT_COOKIEFILE, "/xxx/bar"));
