How can PHP arrays be used to remove duplicate values efficiently?

When dealing with arrays in PHP, removing duplicate values efficiently can be achieved by using the array_unique() function. This function takes an array as input and returns a new array with only unique values, removing any duplicates. This is a simple and effective way to clean up arrays and ensure that each value is unique.

// Input array with duplicate values
$array = [1, 2, 2, 3, 4, 4, 5];

// Remove duplicate values using array_unique()
$uniqueArray = array_unique($array);

// Output the unique array
print_r($uniqueArray);