load config.php with in a class
<?php
$__error_reporting_level=1;
$server='localhost';
$user='root';
$password='';
$dbase='eauction';
?>

<?php
include ('config.php');
error_reporting($__error_reporting_level);

class sql
{
 function connect()
 {
  $connections = mysql_connect($server, $user,$password) or die ('Unabale to connect to the database');
  mysql_select_db($dbase) or die ('Unable to select database!');
  return;
 }

 function login($email, $pwd)
 {
  $this->connect();
  $result = $this->qry("SELECT uid,nameF FROM user WHERE email='".$email."' AND password='".$pwd."'");
  $row=mysql_fetch_array($result);
  if (mysql_num_rows($result)>0)
   return array($row[0],$row[1]);
  else
   return array(0,0);
 }
}
?>

include ('core/sql.php');
$obj = new sql;
$data=$obj->login($email,$pwd);
print_r($data);

<?php
class ConnectionSettings {
    private $hostname = 'localhost';
    private $username = 'root';
    private $password = '';
    private $db = 'cordiac_db';
    protected $connLink;

    // protected 'connect()' method
    protected function connect(){

        // establish connection
        if(!$this->connLink = mysql_connect($this->hostname, $this->username, $this->password)) {
            throw new Exception('Error connecting to MySQL: '.mysql_error());
        }

        // select database
        if(!mysql_select_db($this->db, $this->connLink)) {
            throw new Exception('Error selecting database: '.mysql_error());
        }
    }
}

include ('config.php');
// Now all your variables are defined at global scope!!!
error_reporting($__error_reporting_level);

class sql
{
 // Pass as params to the function
 function connect($server, $user, $password, $dbase)
 {
  $connections = mysql_connect($server, $user,$password) or die ('Unabale to connect to the database');
  mysql_select_db($dbase) or die ('Unable to select database!');
  return;
 }
 // etc...
 // etc...
}

class sql
{
  public $server;
  public $user;
  public $password;
  public $dbase;

  public function __construct($server, $user, $password, $dbase) {
    $this->server = $server;
    $this->user = $user;
    // etc...
    $connections = mysql_connect($this->server, $this->user, $this->password);
  }
}

server=test
user=root
pass=pass
dbname=mydb

class A {

    public $config;

    public function __construct() {
       $this->config = parse_ini_file('config.ini', true);
    }

    public function sql {
        $connections = mysql_connect($this->config['server'], $this->config['user'],$this->config['password']) or die ('Unabale to connect to the database');
  mysql_select_db($this->config['dbase']) or die ('Unable to select database!');
  return;
    }
}

function connect()
 {
    include ('config.php');
  $connections = mysql_connect($server, $user,$password) or die ('Unabale to connect to the database');
  mysql_select_db($dbase) or die ('Unable to select database!');
  return;
 }

config.php
define('SERVER',$server);
define('USER',$user);
define('PASSWORD',$password);
define('DBASE',$dbase);



----------class----------
<?php
include ('config.php');
error_reporting($__error_reporting_level);

class sql
{
 protected  $server=SERVER;
 protected $user=USER;
 protected $password=PASSWORD;
 protected $dbase=DBASE;
 private function connect()
 {
  $connections = mysql_connect($this->server, $this->user,$this->password) or die ('Unabale to connect to the database');
  mysql_select_db($this->dbase) or die ('Unable to select database!');
  return;
 }
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