Online PHP editor | refs for Yf5CM

<?php error_reporting(E_ALL); $a = [ [0,1, 2, 3, 4, 0, 5, 6, 4, 3, 2, 1,0], [0, 2, 3, 4, 0, 5, 6, 4, 3, 2, 0], [0, 3, 4, 0, 5, 6, 7,8,4, 3, 0], [-1,0,1,2,3,4,2,1,0,-1] ]; function getMin( $a ) { return min($a); } foreach ($a as $arr) { while( ( $arr != null ) ) { $arr = array_values(array_filter($arr)); if ($arr == null) { break; } $min = getMin( $arr ); foreach ($arr as &$e) { $e -= $min; } unset($e); echo join(" ",$arr),"\n"; } echo "\n"; }