This function does not accept hyphenated words, which is kind of annoying.
(PHP 4 >= 4.0.2, PHP 5, PHP 7)
pspell_add_to_session — Add the word to the wordlist in the current session
pspell_add_to_session() adds a word to the wordlist associated with the current session. It is very similar to pspell_add_to_personal()
The added word.
TRUE on success or
FALSE on failure.