[Solved] How would I be able to create brackets around my json file using PHP?

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Try it like this:

$employee_data = array();
$categories = array();
$employee_data["mapwidth"] ="2000";
$employee_data["mapheight"] ="2000";

while($row = $result->fetch_array(MYSQL_ASSOC)) {
        $categories[] = $row;
}
$employee_data["categories"] =$categories;
echo json_encode($employee_data);

Refer to this answer to further improve your code.

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solved How would I be able to create brackets around my json file using PHP?