$arr1 = [
["number" => "1001", "empno" => "9991","title"=>""],
["number" => "1001", "empno" => "9992","title"=>""],
["number" => "1002", "empno" => "9991","title"=>""],
["number" => "1002", "empno" => "9992","title"=>""],
["number" => "1001", "empno" => "9990","title"=>""]
];
$arr2 = [
["number" => "1001", "empno" => "9991","title"=>""],
["number" => "1001", "empno" => "9992","title"=>""],
["number" => "1002", "empno" => "9991","title"=>""],
["number" => "1002", "empno" => "9992","title"=>""]
];if you have the above two arrays, just like the unique key value, number and empno cannot have the same array that is a repeat. The above $arr1 , and the last element is a difference element ( ["number" = >" 1001arrays, "empno" = >" 9990 calendar title = > Finance] ), which is a different element. Could you tell me how to find out quickly besides applying two foreach?