Are there any potential pitfalls to be aware of when using array_merge to combine arrays in PHP?

One potential pitfall when using array_merge to combine arrays in PHP is that it does not preserve numeric keys if they are not unique. This can lead to unexpected results if you are relying on specific key-value pairs. To solve this issue, you can use the "+" operator instead, as it will only add elements with keys that do not already exist in the original array. 

$array1 = ['a' => 'apple', 'b' => 'banana'];
$array2 = ['b' => 'blueberry', 'c' => 'cherry'];

$result = $array1 + $array2;

print_r($result);

Keywords

array_merge arrays PHP data loss associative arrays

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