Can user-defined functions be used to improve the process of removing duplicates and originals from an array in PHP?

The issue of removing duplicates and originals from an array in PHP can be solved by creating a user-defined function that iterates through the array, keeping track of unique elements in a separate array. This function can then be called to process any array and return a new array with only unique elements.

function removeDuplicates($arr){
    $uniqueArr = array();
    
    foreach($arr as $element){
        if(!in_array($element, $uniqueArr)){
            $uniqueArr[] = $element;
        }
    }
    
    return $uniqueArr;
}

// Example usage
$array = array(1, 2, 2, 3, 4, 4, 5);
$uniqueArray = removeDuplicates($array);

print_r($uniqueArray);