Creating DBInstance in PHP with Firebird Database

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CREATING DBINSTANCE in PHP with FIREBIRD DATABASE

<?php

class DBInstance{

    private static $instance;
   
    private static $engine;
    private static $dbkey;

    private static $database;
    private static $username;
    private static $password;
    private static $charset;
    private static $buffers;
    private static $dialect;
    private static $role;
    private static $port;
    private static $host;


    private static $message;


    protected function  __construct() {}
    protected function  __clone() {}

    public static function init(){
         $file = parse_ini_file("DBConnect/config.ini",true);
         try{
            self::$database = $file[self::$dbkey]['database'];
            self::$username = $file[self::$dbkey]['user'];
            self::$password = $file[self::$dbkey]['password'];
            self::$charset  = $file[self::$dbkey]['charset'];
            self::$buffers  = $file[self::$dbkey]['buffer'];
            self::$dialect  = $file[self::$dbkey]['dialect'];
            self::$role     = $file[self::$dbkey]['userrole'];
            self::$port     = $file[self::$dbkey]['port'];
            self::$host     = $file[self::$dbkey]['host'];
         }catch(Exception $e){
           self::$message = "config.ini cannot be found.";
         }

    }

    public static function setDBase($dbase){
        self::$dbkey = $dbase;
    }

    public static function setDBEngine($dbengine){
        self::$engine = $dbengine;
    }

    public static function getInstance(){
        if(!self::$instance){
            self::init();           
            if(self::$engine == "FireBird"){
                self::$instance = ibase_connect
                    (
                        self::$host . "/" . self::$port . ":" . self::$database,
                        self::$username, self::$password, self::$charset,
                        self::$buffers, self::$dialect, self::$role
                    );
                    self::$message = "You are now connected to systems database.";
                    if(ibase_errcode()){
                        self::$message = "Ooops... Something went wrong, Unable to establish database connection";
                    }
            }

            if(self::$engine == "MySQL"){
                 self::$message = "MySql Not yet been Implemented";
            }
        }
        return self::$instance;
    }
    public static function getDbError(){
        return self::$message;
    }
   
}
?>