my "sizeof" doesn't work

[eluser]danmontgomery[/eluser]
because you're using where(), so your query looks something like "SELECT * FROM some_table WHERE id_edu = 1 AND id_edu = 2" etc... I'm guessing that id_edu is a primary key, so you're never going to return any results. You want to use either or_where() or where_in(). Something like:

Code:

$checkBox = $this->input->post('checked');
return $this->db->where_in('id_edu', $checkBox)->get($this->tbl);