In PHP 8.4 & PHP 8.3, you can remove duplicate elements from an array using the `array_unique()` function. This function takes an array as input and returns a new array with duplicate values removed.

Here’s how you can do it in PHP 8.4 & PHP 8.3:

<?php
// Sample array with duplicate elements
$array = [1, 2, 2, 3, 4, 4, 5];

// Remove duplicate elements
$uniqueArray = array_unique($array);

// Print the resulting array
print_r($uniqueArray);
?>

Output:

Array
(
[0] => 1
[1] => 2
[3] => 3
[4] => 4
[6] => 5
)

Explanation:

* `array_unique()` removes duplicate values from the array.
* The keys of the original array are preserved. If you want to reindex the array, you can use `array_values()`:

<?php
// Reindex the array
$reindexedArray = array_values($uniqueArray);

// Print the reindexed array
print_r($reindexedArray);
?>

Output:

Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
)

This will give you an array with unique elements and reindexed keys.