I want to work with Postman and PHP without a database [closed]

“I want to work with Postman and PHP without a database. I know this would all be temporary, but it’s just for testing. My goal is to create a temporary database in Postman with 5 to 10 records in JSON format. Then, I want to display that in a PHP API file and be able to insert, update, and delete records within that JSON from the PHP API file. Is this possible without using any kind of database (SQL and NoSQL databases, JSON file, Array, Session, or Cookie)? If yes, how? If no, why not?”

Here is my PHP API code:

<?php
// PHP Script to receive and display JSON data from Postman

// 1. Set the content type header.
// This tells Postman that the response will be in JSON format.
header('Content-Type: application/json');

// 2. Get the raw JSON data from the request body.
// This is the core function that receives data without a database.
$json_data = file_get_contents('php://input');

// 3. Decode the JSON string into a PHP array.
// This makes the data readable and usable in PHP.
$request_data = json_decode($json_data, true);

// 4. Check if data was received.
if ($request_data) {
    // 5. Create a response array with the received data.
    $response = [
        'status' => 'success',
        'message' => 'Data received and displayed successfully!',
        'received_data' => $request_data
    ];
} else {
    // If no data was received.
    $response = [
        'status' => 'error',
        'message' => 'No JSON data received or data is invalid.'
    ];
}

// 6. Encode the PHP array back to JSON and send it as the response.
echo json_encode($response, JSON_PRETTY_PRINT);
?>

Here is Postman result:

    {
        "status": "success",
        "message": "Data received and displayed successfully!",
        "received_data": {
            "user_id": 1,
            "product_name": "Laptop",
            "price": 1200
        }
    }

It still does not display in php file. That is my question – why?

Here is PHP file reault:

{
    "status": "error",
    "message": "No JSON data received or data is invalid."
}