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PHP Global Variable Alternative

, 21 May 2014 CPOL
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A new way to handle globals in php without declaring global identifier.


The custom class below is an alternative to using PHP global variables. It is safe to use this class to control globals being defined once for the application. You can also access the globals within classes and methods without the global identifier.


I created this custom class, because I needed a way to store my globals without being changed by third party code. It achieves this by using PHP Late Static Bindings with self and static declarations.

Custom Class for Handling Globals

    // Handles all the globals for the page.
    class globals 
        private static $vars = array();

        // Sets the global one time.
        public static function set($_name, $_value) 
            if(array_key_exists($_name, self::$vars))
                throw new Exception('globals::set("' . $_name . '") - Argument already exists and cannot be redefined!');
                self::$vars[$_name] = $_value;

        // Get the global to use.
        public static function get($_name) 
            if(array_key_exists($_name, self::$vars))
                return self::$vars[$_name];
                throw new Exception('globals::get("' . $_name . '") - Argument does not exist in globals!');

How to Define Global

Here is an example of how to define a simple and complex global.

// Simple Definition

// Complex Definition with Array
globals::set('SERVER', array(
    'REMOTE_ADDR' => filter_input(INPUT_SERVER, 'REMOTE_ADDR'),

How to Use on Line, Method or Class

The below examples will show you how to use it in your code.

// Using Outside Class
echo globals::get('website');

// Using in Method
function getwebsite()
  echo globals::get('website');

// Using in Class
class websites
  public function getwebsite()
    return globals::get('website');

$websites = new websites();
echo $websites->getwebsite();

// Using Global Array Definition
$SERVER = globals::get('SERVER');

// OR Directly in PHP 5.4
echo globals::get('SERVER')['PHP_SELF'];

Global Variable Redefinition

Once a global variable has been defined, it cannot be changed. So if you define an array, it has to be all at once. The example below shows this.

// Define Once

// Get should be codeproject 
echo globals::get('website');

// Define Twice

// Get should still be codeproject
echo globals::get('website');


I hope this code saves you development time. Smile | :)


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer (Senior) Codevendor
United States United States
Please visit my personal website for my latest codes and updates.

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Comments and Discussions

GeneralMy vote of 3 Pin
Maykonn Welington Candido22-May-14 6:42
memberMaykonn Welington Candido22-May-14 6:42 
GeneralRe: My vote of 3 Pin
M@dHatter23-May-14 0:08
memberM@dHatter23-May-14 0:08 
GeneralRe: My vote of 3 Pin
Maykonn Welington Candido23-May-14 3:39
memberMaykonn Welington Candido23-May-14 3:39 

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