Post multidimensional array using CURL and get the result on server

cURL can only accept a simple key-value paired array where the values are strings, it can't take an array like yours which is an array of objects. However it does accept a ready made string of POST data, so you can build the string yourself and pass that instead:

$str = http_build_query($array);...curl_setopt($ch, CURLOPT_POSTFIELDS, $str);

A print_r($_POST) on the receiving end will show:

Array(    [0] => Array        (            [id] => 1        )    [1] => Array        (            [id] => 0        )    [2] => Array        (            [id] => 11        ))

I would give a go to serialize and unserialize:

1) Before sending your array, serialize it (and set your transfer mode to binary):

(...)curl_setopt($ch, CURLOPT_POST, true);curl_setopt($ch, CURLOPT_BINARYTRANSFER, TRUE);           // need this to post serialized datacurl_setopt($ch, CURLOPT_POSTFIELDS, serialize($array));  // $array is my above data

2) When you receive the data, unserialize it:

$array = unserialize($_POST);

More details here and here

$param['sub_array'] = json_encode($sub_array);

and on the other side

$sub_array= json_decode($_POST['sub_array']);