Php code not working with filters enabled

I am using the latest drupal 6.x install. I have enabled the php filter, and i have that checked in the input format. However when I enter any php code it does not parse it at all it just displays the raw code in the node. I am also using tinymce I tried pasting my code into the html box on tinymce, and directly into the text area with the same failed results. I also disabled tinymce and entered the code in the text area with the same result of it just displaying the raw code rather then executing the php. I have searched all over the forums and cannot find another post that is similar enough to my issue to really get me anywhere with this. I have also deleted the php input filter and disabled the filter module, re-enabled the module, and re-created the input filter to no avail. I have also tried another code module that works like php filter with the same result. I am hoping I do not have a broken install as me and my buddy just spent 14 hours getting this new version of my web site up. So any help on this issue would be greatly appreciated.