HTML function to download JSON stored in MySQL database - php

Question

I would like to be able to save a JSON file that is in a database to the user's PC. In summary, I'm storing setup files from a sim racing game, that use a JSON format, in a database, and I'd like the user to be able to upload/download these JSON files (to share with others, etc).
I've got the upload working, using PDO, so there is a column called setup that is a text data type. I'm using a form, with a $FILES() to fetch the uploaded json file, with some checks to ensure it's a valid setup json.
$setup = file_get_contents($_FILES['setupjson']['tmp_name']); //get json from file uploaded
$setupJSON = json_decode($setup); //decode into object
$car = $setupJSON->carName; //carName from object
if ($obj->searchCarName($car) > 0) // if search matches (car exists)
{
if($obj->insertSingleSetup($_POST["name"], $_POST["description"], $_POST["type"], $car, $_POST["track"], $setup) !== false)
{
header('Location: add.php?success');
exit();
}
else
{
header('Location: add.php?error=Error+adding+the+setup');
exit();
}
}
else
{
header('Location: add.php?error=Please+submit+a+valid+setup');
exit();
}
}
The issue i'm having is downloading the file again. I've been able to view the JSON directly
<?php
include('../db.php');
$setup_id = $_POST['setup'];
try {
$connectionString = sprintf("mysql:host=%s;dbname=%s;charset=utf8mb4",
DB::DB_HOST,
DB::DB_NAME);
$pdo = new PDO($connectionString, DB::DB_USER, DB::DB_PASSWORD);
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$sql = 'SELECT * FROM setups WHERE setup_id= :setupID';
$query = $pdo->prepare($sql);
$query->bindValue(':setupID', $setup_id);
$result = $query->execute();
$setup = $query->fetch(PDO::FETCH_ASSOC);
processSetup($setup);
} catch (PDOException $e) {
die("Could not connect to the database $dbname :" . $e->getMessage());
}
function processSetup($setupRow)
{
$setup = $setupRow['setup'];
$setupJSON = json_decode($setup);
echo '<pre>';
echo $setup;
echo '</pre>';
}
?>
but I can't work out how to download it. I've researched that it's related to headers, but everytime I try something, it never works. I just want the save file dialog to appear with the json, and preferably, the option to set the filename outputted to a chosen variable.

Answer 1

Just figured it out, on the processSetup function, I changed the code to this
function processSetup($setupRow)
{
$setup = $setupRow['setup'];
header('Content-type: application/json');
header('Content-disposition: attachment; filename=setup.json');
echo $setup;
}
If I add some code to give the JSON it's proper filename, it'll be perfect :D