Difference between door frame and door liner????? HELP!!!! Kitchens, doors, rails, stud, tables, chairs, stair cases, garden furniture etc... Find answers and ask questions here!

[annanew4]

Hi all, just wondering if anyone can help me.I need to replace 8 door frames and as you can imagine, that is going to be expensive.Can anyone tell me what the difference between a door frame and a door liner is and if a door liner would do the same job?
Thanks Anna xoxo