[RESOLVED] Strange problem with static function resolution

Saeven

Workaround to the following? This is something I'd never considered, had assumed would work, yet unfortunately does not:


class Foo{

  public static function bar(){
      echo "abc";
  }

}

$var = (object)'Foo';
$var::bar();

Bottom line, I need to be able to use a varvar to statically call a class function bar.

The error unfortunately, is:

arse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in

Which is a pretty neat diagnosis!

Thanks.
Alex

bradgrafelman

$object_name = 'Foo';
eval('$var = new ' . $object_name . ';');
$var::bar();

Saeven

Thanks for the response.

Unfortunately the beauty of static scope is that instantiation is not required. In this case, the static scope was used since the constructors various objects on which the 'bar' function will be called, have varying signatures.

For example:


class Object1{  

  static function bar(){}

  function Object1( $a, $b ){

  }
}

class Object2{  

  static function bar(){}

  function Object2(){

  }
}

would cause that code to fail. It has to be statically scoped as shown above, no object creation permitted.

bradgrafelman

Sorry, I'm an OOP newbie - so would calling something like Foo::bar() work here? If so...

$object_name = 'Foo'; 
eval($object_name . '::bar();');

Saeven

Actually, you threw me toward a new function. Looks like http://ca3.php.net/manual/en/function.call-user-func.php can accomplish what I needed.

Thanks for bouncing off the ideas.

Cheers.
Alex

bradgrafelman

Heh. Sorry I couldn't directly help. Guess that's what I get for venturing into an OOP-related thread 🙁

Drakla

Don't kick yourself in the face, your stuff does work, and expanding on the call user func just for future onlookers

class Foo
{
	public static function bar()
	{
		echo 'I am bar';
	}
}


Foo::bar();		echo ' <- standard<br /><br />';


$cl = 'Foo';

//$cl::bar();	// bad boy!  get to bed!

call_user_func(array($cl, 'bar'));		echo ' <- call_user_func<br /><br />';

eval($cl . '::bar();');		echo ' <- eval<br /><br />';