Json_encode strange behavior - php

Question

I am experiencing some strange behavior when using json_encode.
This is my code:
if($_POST["action"] == 'profile')
{
sleep(2);
$error = '';
$success = '';
$admin_name = '';
$admin_contact_no = '';
$admin_email = '';
$admin_profile = '';
$data = array(
':admin_email' => $_POST["admin_email"],
':admin_id' => $_POST['hidden_id']
);
$visitor->query = "
SELECT * FROM admin_table
WHERE admin_email = :admin_email
AND admin_id != :admin_id
";
$visitor->execute($data);
if($visitor->row_count() > 0)
{
$error = '<div class="alert alert-danger">User Email Already Exists</div>';
}
else
{
$user_image = $_POST["hidden_user_image"];
if($_FILES["user_image"]["name"] != '')
{
$user_image = upload_image();
}
$admin_name = $visitor->clean_input($_POST["admin_name"]);
$admin_contact_no = $_POST["admin_contact_no"];
$admin_email = $_POST["admin_email"];
$admin_profile = $user_image;
$data = array(
':admin_name' => $admin_name,
':admin_contact_no' => $admin_contact_no,
':admin_email' => $admin_email,
':admin_profile' => $admin_profile
);
$visitor->query = "
UPDATE admin_table
SET admin_name = :admin_name,
admin_contact_no = :admin_contact_no,
admin_email = :admin_email,
admin_profile = :admin_profile
WHERE admin_id = '".$_POST['hidden_id']."'
";
$visitor->execute($data);
$success = '<div class="alert alert-success">User Details Updated</div>';
}
$output = array(
'error' => $error,
'success' => $success,
'admin_name' => $admin_name,
'admin_contact_no' => $admin_contact_no,
'admin_email' => $admin_email,
'admin_profile' => $admin_profile
);
echo json_encode($output);
}
Alert message for $error displays accordingly while alert message for $success does not.
If I swap positions between $error = '<div class="alert alert-danger">User Email Already Exists</div>'; and $success = '<div class="alert alert-success">User Details Updated</div>';, $error still works while $success still does not, which deeply confuses me.
I know I can avoid all this trouble by using echo, but I really want to find out what the issue is here.
Thank you for your help.

Answer 1

It was just a spelling error, wrote "succes" instead of "success".
I apologize for the trouble and thank you for your help.