Database Connection PHP using the class PDO.

Connection.php

 <?php
class Connection
{
    public static $db;
    
    private static function doConnection()
    {
        if (!isset(self::$db)) {
            try {
                $host     = "YOUR_HOST";
                $db_name  = "YOUR_DB";
                $user     = "YOUR_USER";
                $pass     = "YOUR_PASS";
                self::$db = new PDO("mysql:host=$host;dbname=$db_name", $user, $pass);
                self::$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                self::$db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_OBJ);
            }
            catch (PDOException $e) {
                echo "CONNECTION ERRO" . $e->getMessage();
            }
        }
        
        return self::$db;
    }
    //ISSO AQUI NUM  TEM NADA A VER
    public static function prepare($sql)
    {
        return self::doConnection()->prepare($sql);
    }
    
} 

Thanks...