Are there any potential pitfalls to be aware of when merging arrays in PHP, especially with nested structures?

When merging arrays in PHP, especially with nested structures, one potential pitfall to be aware of is that the values of duplicate keys will be overwritten by the values of the latter array. To avoid losing data, you can recursively merge the arrays using functions like array_merge_recursive() or array_replace_recursive(). 

$array1 = ['a' => ['b' => 'c']];
$array2 = ['a' => ['d' => 'e']];
$result = array_merge_recursive($array1, $array2);

print_r($result);

Keywords

array_merge array_merge_recursive nested arrays multidimensional arrays data structure

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