What is better, to save the user's post to the database by executing htmlentities() or not?

Question

PHP

If not done, then we do EVERY TIME when visitors open a forum topic! This load on the server!!!!!!!!!!!!!!!
If done - what to do when the user tries to edit his post? after all, as far as I understand, the user needs the original text and not the text with extra characters that htmlentities () made

Answer 1

Most templating engines like twig always do something like <?php echo htmlspecialchars($var, ENT_QUOTES, 'UTF-8') ?> on output. So do not worry, the load on the server is small.

Answer 2

Always keep the original text.
The parsed one can be cached. (although the costs for htmlentites/ htmlspecialchars are very small)