Question

I have a PHP class method which is using a static function from with a another class. How do i enable that static function to modify variables within the calling class.. Example as follows:

PARENT:

class sys_core
{
   public $test = 'no';

   // --------------------
   public function __construct()
   {
   }

   // --------------------
   public function init()
   {
      sys_loader::load_config('123');
      print $this->test;
   }

   // --------------------
   // --------------------
   // --------------------
   // --------------------
   // --------------------

} // END Class

STATIC CLASS

class sys_loader
{
   private $registry = array();

   // --------------------
   public static function load_config($file)
   {
      $this->test = 'yes';
   }

   // --------------------
   // --------------------
   // --------------------
   // --------------------

} // END Class

ERROR:

Fatal error: Using $this when not in object context

Answer 1

As I see it, sys_loader can modify sys_core’s $test 3 ways:

1) sys_loader is passed a reference to sys_core->test,
2) sys_loader returns a new value for it or
3) equip sys_core with a setter for $test and pass sys_loader a reference to sys_core.
With that reference, sys_loader can access whatever variables and functions sys_core allows.

Here are the bits I changed/added to make #3 work:

Example use:

$sc = new sys_core();
$sc->setConfigFile('123');
$sc->init();

Output:
123yes

class sys_core

// new
private $configFile = null;

// new
function getConfigFile() {
  return $this->configFile;
}

// new
function setConfigFile($value) {
  $this->configFile = $value;
}

// new
function setTest($value) {
  $this->test = $value;
}


public function init()
{
// sys_loader::load_config('123');
  sys_loader::load_config($this);
  print $this->test;
}

class sys_loader

// public static function load_config($file)
public static function load_config($caller)
{
// $this->test = 'yes';
  $caller->setTest('yes');
// new, example
  $config = $caller->getConfigFile();
// new, example
  echo $config;
}