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:

<?php

$people = [
  ['first_name' => 'John', 'last_name' => 'Doe'], 
  ['first_name' => 'Jane', 'last_name' => 'Smith'], 
  ['first_name' => 'Bob', 'last_name' => 'Johnson']
];

usort($people, function ($a, $b) {
    return strcmp($a['last_name'], $b['last_name']);
});

print_r($people);

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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.