What potential pitfalls should be avoided when using array_unique() on arrays in PHP?

When using array_unique() on arrays in PHP, one potential pitfall to avoid is that it only removes duplicate values, not keys. This means that if your array has keys that are duplicated but with different values, array_unique() will not remove them. To solve this issue, you can use the combination of array_values() and array_unique() to reindex the array after removing duplicates. 

// Original array with duplicate values and keys
$array = array("a" => "apple", "b" => "banana", "c" => "apple", "d" => "banana");

// Remove duplicate values and reindex the array
$uniqueArray = array_values(array_unique($array));

print_r($uniqueArray);

Keywords

array_unique arrays PHP duplicate values keys

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