How can the PHP documentation for json_encode be leveraged to improve understanding and usage of the function, and what role does echo play in outputting JSON data?

To improve understanding and usage of the json_encode function in PHP, developers can refer to the official PHP documentation for detailed explanations, examples, and usage guidelines. The documentation provides information on the function's parameters, return values, and potential errors, helping developers utilize json_encode effectively in their code. Additionally, echoing the output of json_encode allows developers to easily output JSON data in a readable format for debugging or sending data to clients.

$data = array("name" => "John Doe", "age" => 30, "city" => "New York");
$json_data = json_encode($data);
echo $json_data;