comments are not showing on godaddy - php

Question

i am poorly trapped and also not getting any proper support from the Godaddy customer care. I have a comment section which is working perfectly on localhost and some other hosting but it is not working on Godaddy hosting. I don't understand, why this only occurs on godaddy.
Here is my html :
<div class="comment-form-container">
<form id="frm-comment">
<div class="input-row">
<input type="hidden" name="comment_id" id="commentId" placeholder="Name" /> <input class="input-field" type="text" name="name" id="name" placeholder="Name" />
</div>
<div class="input-row">
<textarea class="input-field" type="text" name="comment" id="comment" placeholder="Add a Comment"> </textarea>
</div>
<div>
<input type="button" class="btn-submit" id="submitButton" value="Publish" /><div id="comment-message">Comments Added Successfully!</div>
</div>
</form>
</div>
<div id="output"></div>
Here is my script :
function postReply(commentId) {
$('#commentId').val(commentId);
$("#name").focus();
}
$("#submitButton").click(function () {
$("#comment-message").css('display', 'none');
var str = $("#frm-comment").serialize();
$.ajax({
url: "comment-add.php",
data: str,
type: 'post',
success: function (response) {
//var result = eval('(' + response + ')');
//var result = eval('(' + JSON.stringify(response) + ')');
if (response) {
$("#comment-message").css('display', 'inline-block');
$("#name").val("");
$("#comment").val("");
$("#commentId").val("");
listComment();
} else {
alert("Failed to add comments !");
return false;
}
}
});
});
$(document).ready(function () {
listComment();
});
function listComment() {
$.post("comment-list.php",
function (data) {
var data = JSON.parse(data);
var comments = "";
var replies = "";
var item = "";
var parent = -1;
var results = new Array();
var list = $("<ul class='outer-comment'>");
var item = $("<li>").html(comments);
for (var i = 0; (i < data.length); i++)
{
var commentId = data[i]['comment_id'];
parent = data[i]['parent_comment_id'];
if (parent == "0")
{
comments = "<div class='comment-row'>"+
"<div class='comment-info'><span class='commet-row-label'>from</span> <span class='posted-by'>" + data[i]['comment_sender_name'] + " </span> <span class='commet-row-label'>at</span> <span class='posted-at'>" + data[i]['date'] + "</span></div>" +
"<div class='comment-text'>" + data[i]['comment'] + "</div>"+
"<div><a class='btn-reply' onClick='postReply(" + commentId + ")'>Reply</a></div>"+
"</div>";
var item = $("<li>").html(comments);
list.append(item);
var reply_list = $('<ul>');
item.append(reply_list);
listReplies(commentId, data, reply_list);
}
}
$("#output").html(list);
});
}
function listReplies(commentId, data, list) {
for (var i = 0; (i < data.length); i++)
{
if (commentId == data[i].parent_comment_id)
{
var comments = "<div class='comment-row'>"+
" <div class='comment-info'><span class='commet-row-label'>from</span> <span class='posted-by'>" + data[i]['comment_sender_name'] + " </span> <span class='commet-row-label'>at</span> <span class='posted-at'>" + data[i]['date'] + "</span></div>" +
"<div class='comment-text'>" + data[i]['comment'] + "</div>"+
"<div><a class='btn-reply' onClick='postReply(" + data[i]['comment_id'] + ")'>Reply</a></div>"+
"</div>";
var item = $("<li>").html(comments);
var reply_list = $('<ul>');
list.append(item);
item.append(reply_list);
listReplies(data[i].comment_id, data, reply_list);
}
}
}
And I am 100% sure that there is no connectivity problem with database. Please help me out.
here is comment-add.php
<?php
require_once ("db.php");
date_default_timezone_set('Asia/Kolkata');
$commentId = isset($_POST['comment_id']) ? $_POST['comment_id'] : "";
$comment = isset($_POST['comment']) ? $_POST['comment'] : "";
$commentSenderName = isset($_POST['name']) ? $_POST['name'] : "";
$date = date("Y-m-d H:i:s", time());
$sql = "INSERT INTO tbl_comment(parent_comment_id,comment,comment_sender_name,date) VALUES ('" . $commentId . "','" . $comment . "','" . $commentSenderName . "','" . $date . "')";
$result = mysqli_query($conn, $sql);
if (! $result) {
$result = mysqli_error($conn);
}
echo $result;
?>
here is comment-list.php
<?php
require_once ("db.php");
$sql = "SELECT * FROM tbl_comment ORDER BY parent_comment_id asc, comment_id asc";
$result = mysqli_query($conn, $sql);
$record_set = array();
while ($row = mysqli_fetch_assoc($result)) {
array_push($record_set, $row);
}
mysqli_free_result($result);
mysqli_close($conn);
echo json_encode($record_set);
?>
here is db.php
<?php
$conn = mysqli_connect("localhost","xxxxxxxxx","xxxxxxxx","xxxxxxxxxx");
?>