instantiate a class within a class once

[papacostas]

Ok I have a problem which i assume is not that complicated,

but it is for me...

 

I have a class called Display that makes calls to a database access class called DAO

where all the SQL code is and the logic for fetching the data.

 

I've always been instantiating this class for every function, (like this)

 

  require_once(classname)

  $DAO = new DAO();

 

which is not very good. so now i want to figure out a way to just do it once

in the beginning of the class and then access is whenever i want to

 

i've played around with constructors, autoload and global variables without getting the result i want.

what can i do?

 

here is a snippet of the class i currently use,

it works fine for fetching single row data but multiple records i will need to access the FetchArray class from the DAO

which fetches the mysql array.

 

any comments are greatly appreciated

 

 

class Display {

 

function getDBArray($function, $id) {

$getArray = call_user_func(array($DAO, $function), $id);

$return = $DAO->fetchArray($getArray);

return $return;

}

function postDBArray($function, $values) {

$postArray = call_user_func(array($DAO, $function), $values);

}

        function getUserInfo($id){

$user = $this->getDBArray('getUserInfo', $id);

echo hello $user['name'] ;

}

}

[trq]

<?php

  class a {

    function foo() {
      echo "foo";
    }

  }

  class b {

    private $a;

    function __construct() {
      $this->a = new a;
    }

    function bar() {
      $this->a->foo();
    }

  }

?>