You are writing a PHP script and you need to store a collection of items, where each item is itself a collection of items. How would you do this using a multidimensional array?

To store a collection of items, where each item is itself a collection of items, you would use a multidimensional array in PHP. In this case, you can use an indexed array with nested arrays for each level of items. Each element of the outer array represents a collection, and within each element, you can have another array representing the nested collection of items. This nesting allows you to create a hierarchical structure for storing and accessing the items. With a multidimensional array, you can easily organize and manipulate complex data structures that involve multiple levels of nested items. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax