PHP Curl Post

$url = "http://www.google.com"; 
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url); // set url to post to 
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);// allow redirects 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return into a variable 
curl_setopt($ch, CURLOPT_TIMEOUT, 3); // times out after 4s 
curl_setopt($ch, CURLOPT_POST, 1); // set POST method 
curl_setopt($ch, CURLOPT_POSTFIELDS, "url=index%3Dbooks&field-keywords=PHP+MYSQL"); // add POST fields 
$result = curl_exec($ch); // run the whole process 
curl_close($ch);  
echo $result;