Online PHP editor | refs for UAFg8

<?php $A = [3,45,67,8]; $B = [ 1 => [1,6,8], 2 => [5,67,3,4,5,66,6], 3 => [55,56,57,58], 4 => [45,80,81,82] ]; $result = []; foreach ($A as $needle) { if ($found = array_keys($B, $needle)) { // something qualified var_export($found); $result = array_merge($result, $found); // store the new key(s) $B = array_intersect($B, $found); // reduce the haystack } echo "Needle: $needle\n"; var_export($B); echo "\n--\n"; var_export($result); echo "\n----\n"; }