Online PHP editor | output for foURE

<?php $exit_price = [ 0 => 2205, 1 => 6680, 2 => 50351, 3 => 100, 4 => 100, 5 => 1200, 6 => 900, 7 => 234, 8 => 2342, 9 => 45654, 10 => 0, 11 => -1, 12 => 1 ]; $stoploss = [ 0 => null, 1 => null, 2 => null, 3 => null, 4 => null, 5 => null, 6 => 145300, 7 => null, 8 => null, 9 => 12222, 10 => 0, 11 => -1, 12 => 1 ]; $result = array_map(function ($x, $y) { if (null !== $y) { return $x - $y; } return null; }, $exit_price, $stoploss); print_r(array_filter($result, function ($z) { return null !== $z; }));