simiple oo about &$myobject

[phprock]

Hi,
can anyone guide me on this issue.

I got a class call db and banner

class Db{
    function connect(){

   }

}



class Banner{

  function Banner($db,$prefix){
     $db->connect("SELECT * FROM ".$prefix."_banner");
  }

}

My question is, why in class banner constructor wheather i use &$db or $db works. $db is object.

Other things why i can't use global variable inside a class , is that a bad practice . I mean in php its work like this

class Banner{

 function Banner(){
   global $db,$prefix;

}

}

[olaf]

You have create a "new" object first read the manual about classes, there is an example that looks like yours

[Shrike]

The & operator passes the variable by reference instead of making a local copy inside of the function Banner. This is good since it saves on memory consumption, and changes made elsewhere to that object will be seen in the reference held by the constructor.

Use of global variables is frowned upon generally, not just in the object oriented world. This is because it is very easy to overwrite global variables, thus causing bugs which are hard to track down.