Question

I’m new at object oriented programming with php. I have a problem. I wrote a code but that does not work. I know it’s easy yet I wonder what’s wrong with it. I take the following error :

<?php

class connectDB
{
     $connection;
     $server= "localhost";
     $userName = "root";
     $password = "";
     $select;
     $dbName = "profiles";


     public function connect()
     {
        $connection = mysql_connect($server,$userName,$password);
        $select = mysql_select_db($dbName,$connection);
     }

      public function query()
      {
            $result = mysql_query($query); 
             if (!$result) { 
                 echo 'Bağlantı Hatası: ' . mysql_error(); 
                 exit;  
            }
      }

      public function end() 
      { 
          mysql_free_result($connection); 
      } 
}


?>

When i try to use it in another file , i take this error now 🙁

Answer 1

A class is not supposed to do something (yes, it does something through methods), it is primarily there to represent something – an object of the real world. The “thing” being represented is the one doing something.

The name

class connectDB

suggests otherwise.

You should learn some OOP principles from a book before attempting to “just group functions”. That’s not what classes are for.

See: https://stackoverflow.com/questions/249835/book-recommendation-for-learning-good-php-oop

In the end you would have either a class Connection or a class Database.

And, since you’ve joined the “OOP club”, you should use PDO.