gistfile1.js

function encode_users(data) {
  var string = '';
  $.each(data, function(index, info) {
    string += '&users[' + index + '][onlineid]=' + encodeURIComponent(info.onlineid);
    string += '&users[' + index + '][comment]=' + encodeURIComponent(info.comment);
  });
  return string;
}

$.ajax({ 
type: "POST",
url: "sync.php",
data: encode_users(users)
})



/*

encode_users([{onlineid: 1, comment: 1}, {onlineid: 2, comment: 2}])

returns :

"&users[0][onlineid]=1&users[0][comment]=1&users[1][onlineid]=2&users[1][comment]=2"


Which can be parsed by:

<?php

print_r($_POST['users']);

?>

Into:

Array
(
    [users] => Array
        (
            [0] => Array
                (
                    [onlineid] => 1
                    [comment] => 1
                )

            [1] => Array
                (
                    [onlineid] => 2
                    [comment] => 2
                )

        )

)


*/