JSON from mysql not display properly through PHP - php

Question

This is my database of mysql on the web
This is my database on the web
This is the PHP file to access the database to get a JSON file, first I select all the "category" cell in the table, then loop through the category, and then loop through the other columns of a category, and assign to an array of $data2, after that assign $data2 and category to br an array of $data, which is the json I want to display.
<?php
header("Access-Control-Allow-Origin: *");
$user = "u348833238_rest"; /* User */
$password = "a!23286029"; /* Password */
$dbname = "u348833238_rest"; /* Database name */
$host = "localhost";
$con = mysqli_connect($host, $user, $password, $dbname);
// Check connection
if (!$con) {
die("Connection failed: " . mysqli_connect_error());
}
// $sel = mysqli_query($con,"select * from restaurant");
// $data = array();
// while ($row = mysqli_fetch_array($sel)) {
// $data[] = array("dishes" => ["name"=>$row['food'], "price"=>$row['price']] , "category"=>$row['category']);
// }
// echo json_encode($data);
$sel = mysqli_query($con,"select distinct category from restaurant");
$data = array();
while ($row = mysqli_fetch_array($sel)) {
$c = $row['category'];
$sel2 = mysqli_query($con,"select * from restaurant where category = $c ");
$data2 = array();
while ($row2 = mysqli_fetch_array($sel2)){
$data2[] = array("name"=>$row2['food'], "price"=>$row2['price']);
}
// echo $data2;
$data[] = array("category"=>$row['category'], "dishes"=>$data2);
}
// echo $data;
echo json_encode($data);
?>
How the JSON is not displayed properly as the array of property "dishes" is empty as below:
the array is empty

Answer 1

I’d recommend turning errors on so you can see where the problem is.
At a guess it’s here:
select * from restaurant where category = $c
Should be:
select * from restaurant where category = '$c'