多条件查询分页

<?php
                                        require_once "../wenjian/DBDA.class.php";
                                        require_once "../wenjian/page.class.php";

//                                        $obj = "select * from book WHERE is_delete= ‘0‘ ";
                                        $obj = "select * from book,gp WHERE book.is_delete= ‘0‘
                                                and gp.gp_name = book.group_name ";
                                        if (!empty($_GET)){
                                            $obj .= !empty($_GET[‘shu‘])?" and book_name like ‘%{$_GET[‘shu‘]}%‘ ":"";
                                            $obj .= !empty($_GET[‘zuozhe‘])?" and writer_name like ‘%{$_GET[‘zuozhe‘]}%‘ ":"";
                                            $obj .= !empty($_GET[‘fen‘])?" and group_name like ‘%{$_GET[‘fen‘]}%‘ ":"";
                                        }
                                        //将查询内容重新建表
                                        $table = "(".$obj.") as t ";
                                        

                                        $obj = "select * from $table WHERE is_delete= ‘0‘ ";
//                                                                echo $obj;
                                        $db = new DBDA();
                                        $zts = "select count(*) from $table WHERE is_delete=‘0‘";
                                        $count = $db->StrQuery($zts);
                                        $page = new Page($count,2);
                                        $obj .= $page->limit;
                                        $data = $db->Query($obj);