To successfully write PHP code in the content of an article, the WYSIWYG editor needs to be turned off through the ‘Users > Your Profile’ menu. It is not enough to simply keep the WYSIWYG editor on, switch to the ‘Code’ tab of the editor in the ‘Write’ menu and save the article. This will render all contained PHP code permanently unuseful.
Instead of turining off the WYSIWYG editor in your user profile you can temporarily disable it for certain articles by using the Deactivate Visual Editor plugin. I haven’t tested it but it sounds like a reasonable solution for you guys that like to use the WYSIWYG editor.
If you still are in need of writing PHP code with the TinyMCE WYSIWYG editor, you may want to experiment with some TinyMCE plugins that may allow to write PHP code. Such experiments are outside of the scope of this plugin. From my point of view there is a general requirements conflict when you are in need of writing PHP code with any kind of WYSIWYG editor. Therefore it is not planned to natively support writing PHP code in the WYSIWYG editor for any upcoming release of the Exec-PHP plugin.
