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function parseJson($json) {
    $data = json_decode($json, true);
    
    if (!$data) {
        return;
    }
    
    foreach ($data as $key => $value) {
        if (is_array($value)) {
            echo "$key:\n";
            parseJson(json_encode($value));
        } else {
            echo "$key: $value\n";
        }
    }
}

$json = '{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    }
}';

parseJson($json);

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