cache the post data of current topic page
calculate the age of a timestamp
calculate on which page of topic a requested posting can be found
verify authentication credentials
check, if execution is to be aborted
checks whether implementation works correct
checks whether implementation works correct
store a checksum locally and compare it, if requested
clears a query string from unencoded chars
set a color. channels can be in hexadecimal '0x00-0xff' or integer '0-255'
converts a string to unicode, if not already in this encoding
set a cookie. encrypted by default; not very tight, but (maybe) enough to beat junior black-hats ;) is automatically disabled, if suhosin is detected and it already encrypts cookies.
create an image. returns the id for all later operations.