[Solved] Generating JSON with PHP [closed]

You can encode an array thus:

$cars = [
    'ALFA' => [
        'title' => 'Alfa Romeo',
        'models' => [ ... ]
    ],
    'ACURA' => [
        'title' => 'Acura',
        'models' => [ ... ]
    ],
];

This can then be run through json_encode().