function post_url($url) {
	$ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, "field=value&field2=value2");
        $content = curl_exec ($ch);
        curl_close ($ch);
        return $content;
}