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print(average(1,2,3,4)) # 2.5

print(average(*[1,2,3,4])) # 2.5

print(average(4)) # 4.0

print(average(0)) # 0.0

print(average()) # None

$items = ['a', 'b', 'c', 'a', 'b', 'c'];

extractItems($items, 'a', 'c');

print_r($items); // ['b', 'b']

$items = [1, 2, 3, 4, 5, 6, 7, 8];

extractItems($items, 4, 5, 6, 7);

print_r($items); // [1, 2, 3, 8]

$items = [1, 1, 2, 1, 1];

extractItems($items, 1);

print_r($items); // [2]

extractItems(['a', 'b', 'c', 'a', 'b', 'c'], 'a', 'c') # ['b', 'b']

extractItems([1, 2, 3, 4, 5, 6, 7, 8], 4, 5, 6, 7) # [1, 2, 3, 8]

extractItems([1, 1, 1, 2, 1, 1], 1) # [2]