Sourcerer - place any code anywhere.
You can now just place your original codes right into your WYSIWYG editor. The only thing you have to do is surround the code with the Sourcerer tags. Easy peasy!
So now you can also use PHP scripts in your content. That opens up a great deal of possibilities.
Easy to use editor button
Sourcerer comes with a very easy to use editor button. This will help you paste your code in a clean format that will not cause any problems. Also it comes with syntax coloring (php, js, css, html).
More information: http://www.nonumber.nl/sourcerer
NoNumber extensions require php 5.3+
See for more requirements: http://www.nonumber.nl/sourcerer#requirements