Add PHP and MySQL versions at the end of glance widget

public function wpdocsGetPhpMysqlVersion() {
        $php_version = phpversion();
        $sql_info = mysqli_get_server_info( mysqli_connect( DB_HOST, DB_USER, DB_PASSWORD, DB_NAME ) );   
        $remove ='/^5.5.5-/i';
        $sql_version = preg_replace($remove,'',$sql_info);

        echo 'PHP version: ' . $php_version . '. ';
        echo 'MySQL version: ' . $sql_version . '.';
}
add_action( 'activity_box_end', 'wpdocsGetPhpMysqlVersion' );