function add_new_type($name, $callback) { $package_library = 'my_custom_library'; $GLOBALS[$package_library][$name] = $callback; } add_new_type('my_custom_type', function($value) { return 'Custom type: ' . $value; });In this example, we use the "add_new_type" function to add a new data type called "my_custom_type." We define a callback function that will be called when this data type is used in our application. This callback function takes a single argument and returns a string that represents the value of the custom data type. The package library that this code belongs to is called "my_custom_library." This library is responsible for managing custom data types and making them available to the rest of the PHP application. Overall, the "add_new_type" function is a useful tool for extending the data types available in your PHP application. With the right callback functions, you can create custom data types that are tailored to the specific needs of your application.