4 $input = darray
["a" => 1, "b" => 2];
5 array_shift(inout
$input);
10 $input = darray
["a" => 1, 23 => 2];
11 array_shift(inout
$input);
16 $input = darray
["a" => 1, -23 => 2];
17 array_shift(inout
$input);
22 $input = varray
["orange", "banana", "apple", "raspberry"];
23 $fruit = array_shift(inout
$input);
30 function main_array_shift() {