Online PHP editor | refs for s7dTO

<?php $arr1 = [ [ 'email' => 'aa@gmail.com', 'name' => 'John Doe', ], [ 'email' => 'bb@gmail.com', 'name' => 'Johnny Sins', ], [ 'email' => 'cc@gmail.com', 'name' => 'Jose Alvarado', ], ]; $arr2 = [ [ 'email' => 'cc@gmail.com', 'country' => 'Japan', ], [ 'email' => 'cc@gmail.com', 'country' => 'China', ], [ 'email' => 'bb@gmail.com', 'country' => 'Korea', ], ]; $final = []; foreach($arr1 as $key=>$ar){ $data = array_count_values(array_column($arr2,'email')); if(!isset($data[$ar['email']])){ $final[] = $ar; } if(isset($data[$ar['email']]) && $data[$ar['email']] < 2){ $ar['country'] = $arr2[$key]['country']; $final[] = $ar; } } print_r($final);