How to access global variable from inside class's function - php

Question

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.

Answer 1

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;

Answer 2

Use Singleton Pattern like this
<?php
class Configs {
protected static $_instance;
private $configs =[];
private function __construct() {
}
public static function getInstance() {
if (self::$_instance === null) {
self::$_instance = new self;
}
return self::$_instance;
}
private function __clone() {
}
private function __wakeup() {
}
public function setConfigs($configs){
$this->configs = $configs;
}
public function getConfigs(){
return $this->configs;
}
}
Configs::getInstance()->setConfigs(['db'=>'abc','host'=>'xxx.xxx.xxx.xxxx']);
class Something{
public function __contruct(){}
public function doIt(){
return Configs::getInstance()->getConfigs();
}
}
var_dump((new Something)->doIt());

Answer 3

Include the file like this:
include("config.php");
class something{ ..
and print the array as var_dump($config); no need of global.

Answer 4

Change your class a bit to pass a variable on the constructor.
<?php
class something{
private $config;
public function __contruct($config){
$this->config = $config;
}
public function doIt(){
var_dump($this->config); // NULL
}
}
?>
Then, if you
include config.php
include yourClassFile.php
and do,
<?php
$my_class = new something($config);
$my_class->doIt();
?>
It should work.
Note: It is always good not to use Globals (in a place where we could avoid them)