PHP Namespace and global variable issue within classes

Question

I am stuck with this confusion where I don't understand why my global $error under my HelperClass() returns empty, where I could verify that $class->error is indeed filled up with data earlier on.

Is there some sort of issues with namespace in this case that I am not aware about? Please give me some pointers.

Here are some of the codes that are relevant.

Under Main file

namespace Core;
$class = new ControllerClass();
$error = $class->error;
// verified that $error prints correctly here
include ViewFile.php;

Under ViewFile.php

$helper = new HelperClass();
// __autoload function took care of the include

Under HelperClass:

namespace Core\Skeleton;

class HelperClass {
public function __construct() {
global $error;
// $error != $class->error as defined earlier    
// $error is empty here
}

mario · Accepted Answer · 2011-12-04 11:34:20Z

8

If you're using an autoloader or include your classes from within another helper function, then the $error variable was never declared in the 'global' scope. It ended up in some local, and got disposed.

Declare it shared right before you assign it a value.

namespace Core;
$class = new ControllerClass();
global $error;
$error = $class->error;

Also while there is nothing wrong with shared variables per se. The name $error seems slightly too generic. Maybe you can up with a less ambigious or more structured exchange variable. $GLOBALS["/var/log"]["controller_error"] or something arrayish.

answered Dec 4, 2011 at 11:34

mario

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