<?php $arr1 = [ "First" =>[ "Name" => "John", "Id" => 123 ], "Second" =>[ "Name" => "Peter", "Id" => 45 ] ]; $arr2 = [ "First" =>[ "Age" => 34, "Id" => 123 ], "Second" =>[ "Age" => 34, "Id" => 45 ] ]; print_r(array_replace_recursive($arr1, $arr2));
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