<?php

// your code goes here

$array1 = [1,2,3];
 
$array2 = [1,2];
 
var_dump(array_diff($array1, $array2));
 
$array3 = [1,2,3];
 
$array4 = $array3;
 
unset($array4[1]);
 
var_dump(array_diff($array3, $array4));
 
$array5 = [['id'=>1],['id'=>2],['id'=>3]];
 
$array6 = [['id'=>1],['id'=>3]];
 
var_dump(array_diff($array5, $array6));