What are some potential pitfalls when using array_unique in PHP?

When using array_unique in PHP, one potential pitfall is that it only removes duplicate values based on their string representation. This means that if you have mixed data types in your array (such as integers and strings that represent the same value), array_unique may not work as expected. To solve this issue, you can use array_values after calling array_unique to reindex the array and ensure that only unique values remain.

$array = [1, '1', 2, '2', 3, '3']; // Array with mixed data types
$unique_values = array_values(array_unique($array));
print_r($unique_values);