Online PHP editor | output for RSQ5j

@ 2018-11-02T16:36:25Z

<?php
function spiralmatrix($arr)
{
	return  $arr 
			? array_merge(
					array_shift($arr), 
					spiralmatrix(array_reverse(transpose($arr)))
			)
			: $arr;
}

function transpose($arr)
{ 
    return $arr
    		? @!$arr[1]
				? array_chunk($arr[0], 1) 
				: array_map(null, ...$arr)
			: $arr;
}
 
print_r(spiralmatrix([]));
print_r(spiralmatrix([[1]]));
print_r(spiralmatrix([[1,2],[4,3]]));
print_r(spiralmatrix([[1,2,3],[8,9,4],[7,6,5]]));
print_r(spiralmatrix([[1,2,3,4],[12,13,14,5],[11,16,15,6],[10,9,8,7]]));
print_r(spiralmatrix([[1,2,3,4],[10,11,12,5],[9,8,7,6]]));

Output for 5.6.38, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8: Array ( ) Array ( [0] => 1 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 [9] => 10 [10] => 11 [11] => 12 [12] => 13 [13] => 14 [14] => 15 [15] => 16 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 [9] => 10 [10] => 11 [11] => 12 )

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