How can JSON be utilized for data exchange between PHP and JavaScript in a more efficient manner?

Using JSON for data exchange between PHP and JavaScript can be more efficient because JSON is a lightweight data-interchange format that is easy to parse and generate in both languages. To utilize JSON for data exchange, you can encode PHP data structures into JSON format using the `json_encode()` function in PHP, and then decode the JSON data in JavaScript using `JSON.parse()`.

// PHP code to encode data into JSON format
$data = array("name" => "John", "age" => 30, "city" => "New York");
$json_data = json_encode($data);
echo $json_data;