CODEWITHSUNDEEP
phpglobal-variables
mr.user1065741
mr.user1065741

Reputation: 692

php global config and settings in application

I have a file 'config.php' which Is included at the beginning of my program (see below) Main file runs require 'config.php';

config.php

<?
global $config;
$config['tblist'] = 'pending'; 
$config['tbdone'] = 'checked';
$config['checkfreq'] = 24;
?>

I then create a new page object

$page = new Page($name,$source);

One of the functions in that page object I want to be able to grab stuff from the config but it doesn't seem to be able to reference to $config. Have I put global $config; in the right place?

Upvotes: 2

Views: 11746

Answers (5)

Aram Kocharyan
Aram Kocharyan

Reputation: 20431

When making references to global variables in functions, you must declare them as global:

global $config;

This is also interesting: http://me.veekun.com/blog/2012/04/09/php-a-fractal-of-bad-design/

There is no way to declare a variable. Variables that don’t exist are created with a null value when first used.

Global variables need a global declaration before they can be used. This is a natural consequence of the above, so it would be perfectly reasonable, except that globals can’t even be read without an explicit declaration—PHP will quietly create a local with the same name, instead. I’m not aware of another language with similar scoping issues.

To be fair it will also throw a Notice if you've got them enabled.

Upvotes: 5

Jon Hulka
Jon Hulka

Reputation: 1309

You can include $config from within your Page object:

class Page
{
    protected $config;
    public function __construct($configPath)
    {
        include $configPath;
        $this->config=$config;
    }
}

Upvotes: 0

penten
penten

Reputation: 141

In the function that needs to use $config, did you first declare $config as global? For example:

function foo() {
    global $config;

    $a = $config['tblist'];
    ....
}

$config will only refer to the global variable if first declared as such, if not it will refer to a variable in the local scope.

You can find more details on globals here: PHP Globals

Upvotes: 2

Walfie
Walfie

Reputation: 3386

Put global $config inside the function before using the variable.

See the PHP manual on variable scope for examples.

Upvotes: 2

Kai
Kai

Reputation: 342

You should in function declare $config is global variable

Maybe you need PHP variable scope

Upvotes: 0

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