php database class

i have created database class in php but i can't understand wh开发者_开发知识库y it has an error:

Fatal error: Using $this when not in object context in C:\xampp\htdocs\test1\Engine\Class\user.php on line 9

here is a code

<?php
    class user{
        private  $db_host = 'localhost';
        private $db_user = 'root';
        private $db_password = '123456';
        private $db_name = 'test';

        private function _dbconnect(){
            mysql_connect($this->db_host,  $this->db_user,  $this->db_password) or die('Unable to connect to Database'); // line 9 (error is here)
            @mysql_select_db($this->db_name) or die( "Unable to select database");
        }

        public function login(){
            self::_dbconnect();
            mysql_close();
        }
    }
?>

---

In your function login you have to do

$this->_dbconnect() 

in stead of

self::_dbconnect()

Bye doing it that way, you are calling the method statically, and thus, using $this in the _dbconnect method does not work.

---

You are calling the method statically

self::_dbconnect();

A static context has no object and therefore $this is undefined.

$this->dbconnect();

---

first _dbconnect is not a static function and you are calling it as a static function

change self::_dbconnect(); to $this->_dbconnect();

---

you are all wrong here is a sollution:

$user = new user();

    <?php
        class user{
            private  $db_host = 'localhost';
            private $db_user = 'root';
            private $db_password = '123456';
            private $db_name = 'test';

            private function _dbconnect(){
//***********************************************
                $user = new user();
//***********************************************
                mysql_connect($this->db_host,  $this->db_user,  $this->db_password) or die('Unable to connect to Database'); // line 9 (error is here)
                @mysql_select_db($this->db_name) or die( "Unable to select database");
            }

            public function login(){
                self::_dbconnect();
                mysql_close();
            }
        }
    ?>

now everything works fine