How can I save variables in database to display in textarea?

Ok, for that you need a placeholder replacement. For e.g. you have text like that

Code:

$txt = "the user %username% are crazy";

This string can be saved in the database and after get it back he has to be replaced with the needed content like that

PHP Code:

str_replace_first('%username%', $r->lastName, $txt_back_from_db); 


See details at http://php.net/manual/de/function.str-replace.php or search here for preg_replace.

Hope this helps.