function xcurl($url,$ref=null,$post=array(),$ua="Mozilla/5.0 (X11; Linux x86_64; rv:2.2a1pre) Gecko/20110324 Firefox/4.2a1pre",$print=false) {    $ch = curl_init();    curl_setopt($ch, CURLOPT_AUTOREFERER, true);    if(!empty($ref)) {        curl_setopt($ch, CURLOPT_REFERER, $ref);    }    curl_setopt($ch, CURLOPT_URL, $url);    curl_setopt($ch, CURLOPT_HEADER, 0);    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);    if(!empty($ua)) {        curl_setopt($ch, CURLOPT_USERAGENT, $ua);    }    if(count($post) > 0){        curl_setopt($ch, CURLOPT_POST, 1);        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);        }    $output = curl_exec($ch);    curl_close($ch);    if($print) {        print($output);    } else {        return $output;    }}