How to add plugin functionality to a class?

[bubu]

I want to add plug-in functionality to a class. That is, I want the class to have a function called load_plugin($file) that includes the $file so that all code inside $file is now functions of the class.

Sounds weird? Let me explain. I have 2 files:

sample-plugin.php

<?php
function new_class_function() {
   $this->name = 'Class Name 2';
}

new_class_function();
?>

myclass.php

<?php
class cms {
   $var name;

   function cms() {
      $this->name = 'class name';
   }

   function load_plugin($file) {
      include $file;
   }
}


$cms = new cms();
echo $cms->name;
$cms->load_plugin('sample-plugin.php');
echo '<br>'.$cms->name;
?>

However, this does not work as PHP says that $this->name does not exists inside new_class_function() (quite obvious if you consider the scope of the function inside the class)

How can I do that? I know runkit and classkit can do this but those are modules not bundled with PHP.

Any questions?