Describe SELinux here.
Throwing some notes in for now...
http://www.lurking-grue.org/gettingstarted_newselinuxHOWTO.html
3 pages link to SELinux:
lib/blame.php:177: Warning: Invalid argument supplied for foreach() (...repeated 3 times)
lib/plugin/WlugLicense.php:99: Warning: Invalid argument supplied for foreach()