update sql database based on edited content of ckeditor in codeigniter3

hi everyone
in codeigniter3 i develop such a project:

in view page i have a ckeditor that displays some content from database in phpmyadmin
now, suppose user change its content on web page.
now i want the new changes applyed to related sql table in phpmyadmin and new content and displayed when the page is re-loaded
how should i define new content of ckeditor as a variable to use for update in sql database

in fact i cannot read the current edited content of ckeditor truely
can any one help me to solve?
thanks in advance