Undefined index when using mysqli_fetch_all() - php

Question

This snippet works only when I make a connection with PDO but I want it with mysqli.-->link
<?php
//fetch_comment.php
//$connect = new PDO('mysql:host=localhost;dbname=tbl_comment', 'root', '');
$connect = mysqli_connect('localhost','root','','tbl_comment');
$query = "
SELECT * FROM tbl_comment
WHERE parent_comment_id = '0'
ORDER BY comment_id DESC
";
$statement = $connect->prepare($query);
$statement->execute();
$result = $statement->fetchAll();
$output = '';
//
foreach($result as $row)
{
$output .= '
<div class="panel panel-default">
<div class="panel-heading">By <b>'.$row["comment_sender_name"].'</b> on <i>'.$row["date"].'</i></div>
<div class="panel-body">'.$row["comment"].'</div>
<div class="panel-footer" align="right"><button type="button" class="btn btn-default reply" id="'.$row["comment_id"].'">Reply</button></div>
</div>
';
$output .= get_reply_comment($connect, $row["comment_id"]);
echo $output;
}
function get_reply_comment($connect, $parent_id = 0, $marginleft = 0)
{
$query = "
SELECT * FROM tbl_comment WHERE parent_comment_id = '".$parent_id."'
";
$output = '';
$statement = $connect->prepare($query);
$statement->execute();
$result = $statement->fetchAll();
$count = $statement->rowCount();
if($parent_id == 0)
{
$marginleft = 0;
}
else
{
$marginleft = $marginleft + 48;
}
if($count > 0)
{
foreach($result as $row)
{
.....
.....
...
?>
I tried to use mysqli fetch_all
$statement = $connect ->prepare("SELECT * FROM tbl_comment
WHERE parent_comment_id = '0'
ORDER BY comment_id DESC");
$statement->execute();
$resultSet = $statement->get_result();
$result = $resultSet->fetch_all();
$output = '';
.....
$statement = $connect ->prepare("
SELECT * FROM tbl_comment WHERE parent_comment_id = '".$parent_id."'
");
$statement->execute();
$resultSet = $statement->get_result();
$result = $resultSet->fetch_all();
$count = $statement->num_rows();
$output = '';
but I am getting this messages:
Notice: Undefined index: comment_sender_name in C:\xampp\htdocs\tbl_comment\fetch_comment.php on line 46
Notice: Undefined index: date in C:\xampp\htdocs\tbl_comment\fetch_comment.php on line 46
Notice: Undefined index: comment in C:\xampp\htdocs\tbl_comment\fetch_comment.php on line 47
Notice: Undefined index: comment_id in C:\xampp\htdocs\tbl_comment\fetch_comment.php on line 48
Notice: Undefined index: comment_id in C:\xampp\htdocs\tbl_comment\fetch_comment.php on line 51
Update: Thanks to #Dharman when I use the MYSQLI_ASSOC it displays me the comments(first MySQL statement) but not the replies (second MySql statement).It worked on PDO. I also have a file to write a comment but when I change from PDO to mysqli it writes it two times in the database:
<?php
//add_comment.php
//$connect = new PDO('mysql:host=localhost;dbname=tbl_comment', 'root', '');
$connect=mysqli_connect('localhost','root','','tbl_comment');
$error = '';
$comment_name = '';
$comment_content = '';
if(empty($_POST["comment_name"]))
{
$error .= '<p class="text-danger">Name is required</p>';
}
else
{
$comment_name = $_POST["comment_name"];
}
if(empty($_POST["comment_content"]))
{
$error .= '<p class="text-danger">Comment is required</p>';
}
else
{
$comment_content = $_POST["comment_content"];
}
if($error == '')
{
$query = "
INSERT INTO tbl_comment
(parent_comment_id, comment, comment_sender_name)
VALUES (:parent_comment_id, :comment, :comment_sender_name)
";
$statement = $connect->prepare($query);
$statement->execute(
array(
':parent_comment_id' => $_POST["comment_id"],
':comment' => $comment_content,
':comment_sender_name' => $comment_name
)
);
$error = '<label class="text-success">Comment Added</label>';
}
$data = array(
'error' => $error
);
echo json_encode($data);
?>

Answer 1

Just use $result = $resultSet->fetch_all(MYSQLI_ASSOC);
By default fetch_all returns numerical array, but you want an associative array. Pass the constant as an argument to fetch_all