How to remove all single root words from an array?

Question

PHP

How to remove all single-root words from an array, leaving one element from such similarities?
An example of an array:
[47] => panel
[48] => pencil case
[49] => overflow
[50] => suspended
[51] => suspended
[52] => suspended
[53] => suspended
We see that the same root for the following elements:
[50] => suspended
[51] => suspended
[52] => suspended
[53] => suspended
Only the first such element should be left in the array, the rest should be deleted.
Thank you.

Answer 1

function clearBySixFirstLetter($array) 
{
    $has = [];
    
    return array_filter(
        $array,
        function ($word) use (&$has) {
            $sixLetters = mb_substr($word, 0, 6);
            
            if (!in_array($sixLetters, $has)) {
                array_push($has, $sixLetters);
                return true;
            }
            
            return false;
        }
    );
}

clearBySixFirstLetter([
    'панель',
    'пенал',
    'перелив',
    'подвесная',
    'подвесного',
    'подвесное',
    'подвесной',   
]);

/*
Array
(
    [0] => панель
    [1] => пенал
    [2] => перелив
    [3] => подвесная
)
*/

Answer 2

Actually, the root in these words is "weight".
School program.
Redo the question