Codeigniter Basic File (image) Upload

gistfile1.txt

public function imgUpload($file) {
		$config['upload_path'] = './assets/property/images/';
		$config['allowed_types'] = 'gif|jpg|png|jpeg';
		$config['max_size']	= '6000000';
		$config['max_width']  = '10024';
		$config['max_height']  = '5768';

    //load codeigniter upload helper/libary/magic thing
		$this->load->library('upload', $config);

		if ( ! $this->upload->do_upload($file))
		{
		  //upload error, return false
			$error = array('error' => $this->upload->display_errors());
			return false;
		}
		else
		{
		  //upload success, return uploaded file name
			$data = array('upload_data' => $this->upload->data());
			return $data['upload_data']['file_name'];
		}
	}