Online PHP editor | refs for t6duF

<?php $x = ['1', '2']; $y = ['2', '1']; $z = ['1', '2', '4']; $n = [1, 2]; echo array_diff($x, $y) === array_diff($y, $x) ? 'y1' : 'n1'; echo array_diff($x) === array_diff($z) ? 'y2' : 'n2'; echo array_diff($z); echo array_diff($x) === array_diff($n) ? 'y3' : 'n3';