如何将数据附加到服务器端的curl函数？

Question

I have to pass an array of data to server and also get response from server ..I am getting undefined variable error on clientside.php where i am trying to print_r the recieved ..How do i get the response at the server side and send it back to client side with additional information ..I am using curl function to achieve this ..

My clientside.php

 $url = "http://some_ip_address/../../../../serverside.php";
    //$abc is variable which contains all data in array format 
    $abc;
    $post_data = array('data' => serialize($abc)); 
    $ch = curl_init();
        curl_setopt($ch, CURLOPT_POST,1);
        curl_setopt($ch, CURLOPT_POSTFIELDS,$post_data);
        curl_setopt($ch, CURLOPT_URL,$url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
        if(curl_exec($ch) === false) {
        echo 0;
        } else {
        echo 1;
        }


$output= curl_exec($ch);
echo $output;
curl_close ($ch);

My Serverside.php goes like this

print_r($_POST['data']);

I am getting the following error

*Notice: Undefined index: data* 

Answer 1

Try http_build_query():

curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));

Do not call curl_exec twice:

client.php

$url = "http://some_ip_address/../../../../serverside.php";
//$abc is variable which contains all data in array format 
$abc;
$post_data = array('data' => serialize($abc)); 
$ch = curl_init();

curl_setopt($ch, CURLOPT_POST,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);

$output= curl_exec($ch);
echo $output;
curl_close ($ch);

serverside.php:

 print_r($_REQUEST);