1 <?php
 2 $arr1 = [
 3     ‘a‘ => 1,
 4     ‘b‘ =>
 5         [‘a‘ => 2],
 6     ‘c‘ => 3,
 7     ‘e‘ => 7,
 8 ];
 9 
10 $arr2 = [
11     ‘a‘ => 3,
12     ‘b‘ => 4,
13     ‘c‘ =>
14         [‘d‘ => 5],
15     ‘d‘ => 6,
16 ];
17 print_r(array_replace_recursive($arr1,$arr2));