How can the use of array_unique() and array_slice() functions help in managing duplicates in PHP arrays?

When dealing with PHP arrays that may contain duplicates, the array_unique() function can be used to remove duplicate values from the array. Additionally, the array_slice() function can be used to extract a portion of the array, which can help in managing large arrays by limiting the number of elements being processed.

// Remove duplicates from an array
$array = [1, 2, 2, 3, 4, 4, 5];
$uniqueArray = array_unique($array);

// Extract a portion of the array
$subsetArray = array_slice($array, 0, 3);