ใช้ Uploadify กับ CodeIgniter เก็บข้อมูลเข้า Database ไม่ได้

if (!empty($_FILES)) {
	$tempFile = $_FILES['Filedata']['tmp_name'];
	$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
	$targetFile =  str_replace('//','/',$targetPath) . $_FILES['Filedata']['name'];

            $this->db->set('gal_path', $_FILES['Filedata']['name']);
            $this->db->insert('tb_gallery');
		
	    move_uploaded_file($tempFile,$targetFile);
	    echo str_replace($_SERVER['DOCUMENT_ROOT'],'',$targetFile);
}
?>