Problem with protectedSource

I `v used this config.
But now something wrong with protectedSource
My version is 3.5.2

CKEDITOR.editorConfig = function(config) {
   config.defaultLanguage = 'ru';
   config.height = '350px';
   config.protectedSource.push(/<\?[\s\S]*?\?>/g);
   config.skin = 'office2003'; 
};

For example config.skin works, but protectedSource dosen`t work.
Input file:

html ...
<? title('contacts'); ?>
html ...

after saving thougth ckeditor, i had something like that, with addition paragraph (<p>)
html ...
<p>&lt;? title(&#39;Contacts&#39;); ?&gt;</p>
html ...

Can you help me?
I need leave php code originaly ...