Question

i want to insert php calendar to my page ..
which is the best way to do it

Answer 1

If it makes your life easier, you can embed a Google calendar.

–EDIT–
Well, according to the tags on the post – which i only noticed now – your question is about how to add a calendar using CodeIgnniter.
Here:

$this->load->library('calendar');

echo $this->calendar->generate();