Question

This is dbconnect.class.php:

<?php  

class Connect 
{ 
    public $error; 
    protected $db; 
    public function __construct() 
    { 
        $link = mysql_connect("localhost","root","1") or $this->error = mysql_error(); 
        $db = mysql_select_db("tarih",$link); 
        $this->db = $db; 
    } 
} 
?>

And this is main php file:

<?php
//header.class.php 
require_once 'dbconnect.class.php'; 

class Header extends Connect 
{ 
    public $headers = array(); 
    private $baglan; 
    public function __construct() 
    { 
        /* 
        * Bu sınıf sayfaların header bilgilerini işler. 
        */ 
        $baglan = $this->db; 
    } 

    public function sayfaHeader($sayfa = true) 
    { 
        $sql = "SELECT * FROM header WHERE id='" . $sayfa . "'"; 
        $query = mysql_query($sql,$this->baglan); 
    } 


} 

Header::sayfaHeader(); 
?>

When I run main php file I see this error:

Fatal error: Using $this when not in object context in C:\AppServ\www\ilk\class\header.class.php on line 19  

Line 19:

$query = mysql_query($sql,$this->baglan);  

Where is the problem? I can’t see problem becuase I’m not writing php code for so long.

Answer 1

Header::sayfaHeader(); 

It calls method without object creation. You have to do this

Header obj = new Header();
obj->sayfaHeader();

If you want to call class’s method then declare method as static. But you cant use $this reference because static methods and memebers haven’t reference on class object.

UPDATE:
mysql_select_db returns bool value. You have to use your $link variable for querying.