Properly include PHP code into posts and pages, and maybe even widgets, in WordPress.
MaGiKS Proper PHP Include lets you easily, quickly, efficiently and safely insert PHP code into posts, pages and / or widgets, without disabling the Visual Editor. You simply upload a php file containing your code into your theme folder and use a WordPress shortcode to "include" that file into your posts / pages / widgets.
This plugin uses a filter to add shortcode capability for widgets in case that functionality isn't already present. If it is, then it is redundant, and I'm sorry ;)