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Get last insert id after insert query CodeIgniter framework

In this example i am going to show you how to get the last insert id after insert data in database.

function save_data($student_data){
$this->db->insert('student_db', $student_data);
$insert_id = $this->db->insert_id();
return $insert_id;

insert_id() function will return zero if table does not have auto incremented column so make sure table must have a column with AUTO_INCREMENT attribute.