Curl is enable but didnot return value - php

Question

I have installed curl. and configuration on my system is
cURL support enabled
cURL Information 7.35.0
Age 3
I have write code in my project is :
$curl = curl_init();
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC ) ;
curl_setopt($curl, CURLOPT_SSLVERSION,6);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($curl, CURLOPT_HEADER, FALSE);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $postfields );
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)");
curl_setopt($curl, CURLOPT_URL, $submit_url);
$curl_execute = curl_exec($curl);
curl_close($curl);
Its not giving me value on my local machine while working fine on server. What is problem?
My PHP version is
5.5.9-1ubuntu4.5
I am using ubuntu 13.10
what is problem with my local machine? what i am missing. please suggest what to do?
Edit :
If i missed any information to write, please inform me.. i am using curl very first time.

Answer 1

At first define the URL and post values correctly, I have added examples, please try this:
// define url examples
$submit_url = 'http://localhost/phptest/service.php';
// post fields examples
$postfields = 'name=foo&pass=bar&format=json';
// Start the process:
$curl = curl_init();
// Tell cURL to fail if an error occurs:
curl_setopt($curl, CURLOPT_FAILONERROR, 1);
// Allow for redirects:
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
// Assign the returned data to a variable:
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
// Set the timeout:
curl_setopt($curl, CURLOPT_TIMEOUT, 5);
// Use POST:
curl_setopt($curl, CURLOPT_POST, 1);
// Set the POST data:
curl_setopt($curl, CURLOPT_POSTFIELDS, $postfields);
curl_setopt($curl, CURLOPT_URL, $submit_url);
// Execute the transaction:
$result = curl_exec($curl);
// Close the connection:
curl_close($curl);
// Print the results:
print_r($result);