<?php
class Test {

    static protected array $test = array();

    protected $words = array();

    public static function addWord($word)
    {
        self::$test[] = $word;
    }

    public function __construct()
    {
        $this->words = array_map(
            fn ($array) => $array, self::$test
        );
    }

    public function showWords()
    {
        foreach ($this->words as $w) {
            echo $w . '<br />';
        }
    }
}


Test::addWord('test');

$t = new Test;
$t->showWords();

Test::addWord('test 2');
echo '<br />';
$t = new Test;
$t->showWords();
?>