USE keyword in php anonymous function

I have found a nice use of USE keyword in php anonymous function from Erik’s blog

According to his article:

The use keyword allows you to introduce local variables into the local scope of an anonymous function. This is useful in the case where you pass the anonymous function to some other function which you have no control over.

function remove_lowest_average($arr) 
	$average = array_sum($arr) / count($arr);

	return array_filter($arr, function($v) use ($average) {
		return ($v > $average);

following is an array with 9 elements which sum up to 45. 
Average value is 5. 
So value <= 5 will be omitted.
$input = array(1,2,3,4,5,6,7,8,9);
// Output: array(6,7,8,9);

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