concat two mysql tables and convert it to json with php - php

Question

I'm using PHP with PDO for a project
I have the following two tables in my database.
Category
CategoryID | Name | CategoryCode
1 | Fixed | FA
2 | Consumable | CA
3 | Intangible | IA
Type
TypeID | CategoryID | Name | TypeCode
1 | 1 | Furniture | FU
2 | 1 | Computers & Computer Peripherals | CP
3 | 1 | Electrical Appliances | EA
4 | 1 | Machinery | MA
5 | 2 | Computer Peripherals | PE
6 | 3 | Software | SW
I need to get a output like below from the select operation. I have tried it with group concat and then fecthAll(), but it doesn't give me the result in correct JSON
Output
[
{
"CategoryID": 1,
"Name": "Fixed",
"CategoryCode": "FA",
"Types": [
{
"TypeID": 1,
"Name": "Furniture",
"TypeCode": "FU"
},
{
"TypeID": 2,
"Name": "Computers & Computer Peripherals",
"TypeCode": "CP"
},
{
"TypeID": 3,
"Name": "Electrical Appliances",
"TypeCode": "EA"
}
]
},
{
"CategoryID": 2,
"Name": "Consumable",
"CategoryCode": "CA",
"Types": [
{
"TypeID": 5,
"Name": "Computer Peripherals",
"TypeCode": "PE"
}
]
}
]

Answer 1

Figured it out this way to get my intended output
protected function getCategories(){
$dbConnection = $this->connect();
$catSql = 'SELECT * FROM `category`';
$stmt = $dbConnection->prepare($catSql);
$stmt->execute();
$result = $stmt->fetchAll();
$output = array();
foreach ($result as $row) {
$line = array("CategoryID" => $row['CategoryID'], "CategoryName" => $row['Name'], "CategoryCode" => $row['CategoryCode']);
$typeSQL = 'SELECT
TypeID,
Name,
TypeCode
FROM type
WHERE
CategoryID = ' . $row['CategoryID'];
$stmt2 = $dbConnection->prepare($typeSQL);
$stmt2->execute();
$types = $stmt2->fetchAll();
$typeArray = array();
foreach ($types as $type) {
$typeLine = array("TypeID" => $type['TypeID'], "TypeName" => $type['Name'], "TypeCode" => $type['TypeCode']);
array_push($typeArray, $typeLine);
}
$line['Types'] = $typeArray;
array_push($output, $line);
}
return json_encode($output);
}