PHP sort array alphabetically using a subarray value

In PHP, you can use the "usort" function to sort an array by a specific value of a subarray. Here is an example of how you would sort an array of people by their last names alphabetically:

Example of using the "usort" function to sort an array by a specific value of a subarray in PHP

This will output:

Array
(
    [0] => Array
        (
            [first_name] => Bob
            [last_name] => Johnson
        )

    [1] => Array
        (
            [first_name] => John
            [last_name] => Doe
        )

    [2] => Array
        (
            [first_name] => Jane
            [last_name] => Smith
        )
)

You can also use "array_multisort" to sort by multiple subarray values.