What are the potential pitfalls of using array_merge() in PHP?

One potential pitfall of using array_merge() in PHP is that it does not handle associative arrays with numeric keys correctly. This can lead to unexpected results where keys are overwritten or values are not merged as expected. To solve this issue, you can use the "+" operator to merge arrays instead, which preserves keys and ensures that values are combined correctly. 

$array1 = ['a' => 1, 'b' => 2];
$array2 = ['b' => 3, 'c' => 4];

$mergedArray = $array1 + $array2;

print_r($mergedArray);

Keywords

array_merge PHP associative arrays numeric arrays keys

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