You did not select a file to upload. PHP Code Igniter

Change:

$this->upload->do_upload()

To this:

$this->upload->do_upload('my_file_input_name')

and it will work!! :)

php codeigniter file-upload controller

Change:

<?php echo form_open_multipart('search/post_func');?>

php codeigniter file-upload controller

Your form type should be "multipart"
Change your form tag to:

 <?php echo form_open_multipart('search/post_func');?>

CodeHunter