What function builds a thread

[kau]

What function builds a thread and calls the handle_bbcode_img to parse a IMG tag.

AND

How would I do a validation on what user posted what thread in order for it to parse for that user. LOL. Hard to say.

[Xenon]

build_new_post() builds posts and thread, depending on the parameters you submit

[Colin F]

The threadstarters userid is stored in the database in the thread table, iirc.