What is a JSON URL and how is it typically used in PHP applications?

A JSON URL is a URL that returns data in JSON format. In PHP applications, JSON URLs are commonly used to fetch data from external APIs or web services. To retrieve data from a JSON URL in a PHP application, you can use the `file_get_contents()` function to fetch the JSON data from the URL and then use `json_decode()` function to convert the JSON data into a PHP array or object for further processing.

// Example of fetching data from a JSON URL in PHP
$json_url = 'https://api.example.com/data.json';
$json_data = file_get_contents($json_url);
$data = json_decode($json_data);

// Accessing the data
foreach ($data as $item) {
    echo $item->name . '<br>';
    echo $item->email . '<br>';
}