Is it more efficient to work with arrays instead of strings in PHP for removing duplicates?

Working with arrays is generally more efficient than working with strings when removing duplicates in PHP. This is because arrays provide built-in functions like `array_unique()` that can easily remove duplicate elements. By converting a string to an array, you can leverage these array functions to efficiently remove duplicates.

// Convert string to array, remove duplicates, and convert back to string
$string = "hello world";
$array = str_split($string);
$uniqueArray = array_unique($array);
$uniqueString = implode("", $uniqueArray);

echo $uniqueString;