The standard Drupal mantra is "Filter on output." So do not filter before saving to the DB. You should filter when rendering the data. You should not use both functions together - that's asking for double encoding issues. Check_markup() will run the data through your input filters and make it safe - assuming that your filters are properly set up.
Nancy
Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.
From: Vaibhav Jain
I am using D6, want to use check_plain and check_markup functions.
What is the best time to use these functions and why ?
Should they be used before data is saved to DB
OR
Just before the data is rendered.
I am trying to use both the functions on the same piece of text, firstly escape with check_plain and then implement check_markup to implement few set of filters.