Online PHP editor | refs for hnC20

<?php $a[] = ["ID" => 101, "CODE" => 1]; $a[] = ["ID" => 105, "CODE" => 2]; $a[] = ["ID" => 109, "CODE" => 2]; $b[] = ["ID" => 105, "Amount" => 200]; $b[] = ["ID" => 101, "Amount" => 100]; $keys = array_merge(array_keys($a[0]), array_keys($b[0])); $template = array_combine($keys, array_fill(0, count($keys), null)); $a = array_column($a, null, "ID"); $b = array_column($b, null, "ID"); ksort($a); ksort($b); $res = array_map(function ($e1, $e2) use ($template){ if ($e1 && $e2) return array_merge($e1, $e2); $e = $e1 ? $e1 : $e2; return array_replace ($template, $e); }, $a, $b); print_r($res);