[PHP] References Explained... (This time Im stumped)

[Gerard Samuel]

I could have sworn that references and I used to get along...

In the menu::hasChild method, I cant seem to reference $this->_data.
$this->_data is supposed to be a reference to the original array $array
in the local scope.
The only way to make this script work is to call on the $GLOBALS array
in menu::hasChild.
Could anyone explain to me, why I'm unable to use $this->_data
in menu::hasChild?

Im using PHP 4.3.8.
Thanks for any info you can provide...

-- Code Snip --
<?php

header('content-type: text/plain');

$array = array (
  '0000000000000000' =>
  array (
    'id' => '0000000000000000',
    'pid' => '0',
    'name' => 'Home',
    'url' => 'index.php',
  ),
  'AB4wFQI2QUewz3P7' =>
  array (
    'id' => 'AB4wFQI2QUewz3P7',
    'pid' => '0000000000000000',
    'name' => 'User',
    'url' => 'modules/user/index.php',
  ),
  'AB4wFQI2QU2iY4SP' =>
  array (
    'id' => 'AB4wFQI2QU2iY4SP',
    'pid' => 'AB4wFQI2QUewz3P7',
    'name' => 'Admin',
    'url' => 'modules/user/admin/index.php',
  ),
  'AB4wFQI2QU2ihsz2' =>
  array (
    'id' => 'AB4wFQI2QU2ihsz2',
    'pid' => 'AB4wFQI2QU2iY4SP',
    'name' => 'delete',
    'url' => 'modules/user/admin/list_to_delete.php',
  ),
  'AB4wFQI2QUp0uEk7' =>
  array (
    'id' => 'AB4wFQI2QUp0uEk7',
    'pid' => 'AB4wFQI2QUewz3P7',
    'name' => 'Edit Account',
    'url' => 'modules/user/edit_account.php',
  ),
  'AB4wFQI2QUp2huwX' =>
  array (
    'id' => 'AB4wFQI2QUp2huwX',
    'pid' => 'AB4wFQI2QUewz3P7',
    'name' => 'Login',
    'url' => 'modules/user/login.php',
  ),
  'AB4wFQI2QUpzujZ8' =>
  array (
    'id' => 'AB4wFQI2QUpzujZ8',
    'pid' => 'AB4wFQI2QUewz3P7',
    'name' => 'Register',
    'url' => 'modules/user/register.php',
  ),
);

$menu = new menu;
$data = $menu->constructMenuData( $array );
var_dump($data);

class menu
{
    var $_data = array();

    function constructMenuData(&$raw_data)
    {
        $data = array();

        $this->_data =& $raw_data;

        foreach($this->_data as $key => $value)
        {
            $data[ $key ]['name'] = $value['name'];
            $data[ $key ]['url']  = $value['url'];

            $child = $this->hasChild( $value['id'] );

            if (!empty($child))
            {
                $data[ $key ]['sub'] = $this->constructMenuData( $child );
            }
        }

        return $data;
    }

    function hasChild($id)
    {
        $data = array();

//        foreach($this->_data as $key => $value)
        foreach($GLOBALS['array'] as $key => $value)
        {
            if ($value['pid'] === $id)
            {
//                $data[ $key ] = $this->_data[ $key ];
                $data[ $key ] = $GLOBALS['array'][ $key ];
            }
        }

        return $data;
    }
}

?>

-- End Code snip --

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