Thank you very much!!! The PHP version is 5.6. with MRBS version of 1.5.0 but i did many modifications in the code so unfortunately I can't upgrade.
Too many session files
OK, now I solved, I have to use $booking['room_id'] = 22; Instead of $room_id = 22; Sorry.
Sorry, the title was wrong, but I can't delete the post.
Move booking to another room when checkbox is active
Locale works only in the pages php
Controlling hidden days
Thank you very much!