How to access global variable from inside class's function

I have file init.php:

<?php 
     require_once 'config.php';
     init::load();
?>

with config.php:

<?php 
     $config = array('db'=>'abc','host'=>'xxx.xxx.xxx.xxxx',);
?>

A class with name something.php:

<?php
     class something{
           public function __contruct(){}
           public function doIt(){
                  global $config;
                  var_dump($config); // NULL  
           }
     } 
?>

Why is it null?
In php.net, they told me that I can access but in reality is not . I tried but have no idea. I am using php 5.5.9.

The variable $config in config.php is not global.

To make it a global variable, which i do NOT suggest you have to write the magic word global in front of it.

I would suggest you to read superglobal variables.

And a little bit of variable scopes.

What I would suggest is to make a class which handles you this.

That should look something like

class Config
{
    static $config = array ('something' => 1);

    static function get($name, $default = null)
    {
        if (isset (self::$config[$name])) {
            return self::$config[$name];
        } else {
            return $default;
        }
    }
}

Config::get('something'); // returns 1;