http://en.wikipedia.org/wiki/List_of_HTTP_header_fields

PHP-FIG FAQ PSR-0 Autoloading Standard PSR-1 Basic Coding Standard PSR-2 Coding Style Guide PSR-3 Logger Interface Symfony2 Coding Standards

“The PSR-1 and PSR-2 Coding Standards fixer for your code” http://cs.sensiolabs.org/