What potential issues can arise when using the array_unique function in PHP?

When using the array_unique function in PHP, potential issues can arise if you are working with associative arrays. The function only removes duplicate values, not keys, so if you have duplicate values with different keys, those will not be removed. To solve this issue, you can combine array_values and array_unique functions to reindex the array after removing duplicates. 

// Example array with duplicate values but different keys
$array = array("a" => "apple", "b" => "banana", "c" => "apple");

// Remove duplicate values while preserving keys
$array = array_values(array_unique($array));

print_r($array);

Keywords

array_unique PHP duplicate values array manipulation data integrity

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