This is something I’ve had to add early on as I needed it to create the little submenus within a page.
This is a Plugin – it is called EXEC-PHP and if you go into your Admin Area, it’s a simple as…

• Click on Plugins
• From the drop down menu – Click on Add New
• In the “Search for plugins by keyword, author, or tag” text box type in “Exec-PHP” (without the quotes)
• Click on “Search for Plugins”

It should appear high in the list.

• Then Click on “Install” under actions on the right of it’s list entry.

And you are done.

Now, when we start adding actual PHP Code in our pages, it will execute correctly.
Note: I’ve not as yet, tried to display any PHP code on any pages. That will be interesting.