ckeditor .. 일단 참조하기

https://ckeditor.com/forums/CKEditor/local-image-cant-display

https://stackoverflow.com/questions/10392582/how-to-add-a-field-to-post-values-in-ckeditor-uploadhttp://huskdoll.tistory.com/121

http://huskdoll.tistory.com/121

https://docs.ckeditor.com/#!/guide/dev_howtos_file_upload

http://www.toughman.pe.kr/index.php/2017/04/30/ckeditor-%EC%9D%B4%EB%AF%B8%EC%A7%80-%ED%8C%8C%EC%9D%BC-%EC%97%85%EB%A1%9C%EB%93%9C-%EC%A0%81%EC%9A%A9/

csrf 이거 먼저 ;.. 참조 

http://codeigniter-kr.org/bbs/view/tip?idx=8308