[PHP]Klasa Database w user_Class Opcje

[goartur]

Chcialbym uzywac class Database w innych classach(chodzi mi o sprawdzanie danych o uzytkowniku), lecz nie wiem jak to zrobic moje pliki:
connection.php

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const DB_HOST = 'localhost';
 
const DB_NAME = 'enigma';
 
const DB_USERNAME = 'root';
 
const DB_PASSWORD = '';
 
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require 'connection.php';
class db
{
    public function db()
    {
        $this->db = new mysqli(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_DATABASE);
 
 
        if (mysqli_connect_errno()) {
 
            echo "Error: Could not connect to database.";
 
            exit;
 
        }
 
    }
}
 
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user_Class

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class user_access{
 
    public function check_login($login,$password){
        $password = sha1($password);
        $sql = "SELECT * FROM admins WHERE username = '$login' AND password = '$password'";
    }
 
}
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Teraz moje pytanie jak moge wykonac zapytanie do mysql z user_Class pobierajac baze z class db?