$arr1 = ['a'=>'aaa','b'=>'bbb',1=>'1',2=>2];
$arr2 = ['a'=>'bbb','b'=>'ccc',2=>2];
$arr = array_diff_assoc($arr1,$arr2);
echo '';
print_r($arr);
result:
Array
(
[a] => aaa
[b] => bbb
[1] => 1
)
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