What is the significance of the "use" keyword in the context of solving the sorting problem in PHP?

The "use" keyword in PHP is used to import variables from the parent scope into an anonymous function. This is particularly useful when dealing with sorting functions that require access to variables outside of their scope, such as custom sorting criteria or external data.

$customVariable = 10;

usort($array, function($a, $b) use ($customVariable) {
    // Custom sorting logic using $customVariable
    return $a - $b;
});