web/app/model/Teamtable.php

<?php

class Teamtable
{
    public PDO $dbh;

    public function __construct(Database $database)
    {
        $this->dbh = $database->conn;
    }

    public function getTable(): array
    {
        $sth = $this->dbh->query('SELECT * FROM lagtabell');
        return $sth->fetchAll(PDO::FETCH_ASSOC);
    }

    public function deleteTeamByID(int $LagID): void
    {
        $sth = $this->dbh->prepare('DELETE FROM lagtabell WHERE LagID = ?');
        $sth->execute([$LagID]);
    }

    public function getTeamByID(int $LagID) # Mixed, array if exists, false if not
    {
        $sth = $this->dbh->prepare('SELECT * FROM lagtabell WHERE LagID = ?');
        $sth->execute([$LagID]);
        return $sth->fetch(PDO::FETCH_ASSOC);
    }

    public function updateTeam(int $id, array $params): void
    {
        $sth = $this->dbh->prepare('UPDATE lagtabell SET  WHERE LagID = ?');
        $sth->execute([$params]);       
    }

    public function addTeam(int $id, array $params): void
    {
        // todo ...
    }
}