addition of php documentation from ezyang's work in #200880.

version.

Replaced README with an updated version.
Added CHANGELOG.txt.

only catch quotes around a string literal array index with lower case literals -- because define constants are ok, and define constants should be upper case

file was present, etc.

Fixed a typo for confirm_submit warning and changed hook_help warning to also
match on the word "function" before it.

db_result() calls that contained db_query()

D5

http://drupal.org/node/114774#book_module

encouraged to replace that with $severity WATCHDOG_DEBUG for consistency.