index2.php

<?php

class Hello {

        private string $url;

        private function __construct() {}

        public function getUrl(): string {
                return $this->url;
        }

        public static function fromArray(array $row): self {

                $hello = new Hello;
                $hello->url = $row['url'];

                return $hello;
        }

}

$hello = Hello::fromArray(['url'=>'https://medium.com']);
echo $hello->getUrl();