phpcms v9的搜索功能默认是按当前模型搜索，简单修改一下改为不按模型搜索全站内容更友好。

打开 /phpcms/modules/search/index.php ，修改后的内容如下

<?php
defined('IN_PHPCMS') or exit('No permission resources.');
pc_base::load_sys_class('form','',0);
pc_base::load_sys_class('format','',0);
class index {
    function __construct() {
        $this->db = pc_base::load_model('search_model');
        $this->content_db = pc_base::load_model('content_model');
    }

    /**
     * 关键词搜索
     */
    public function init() {
        //获取siteid
        $siteid = isset($_REQUEST['siteid']) && trim($_REQUEST['siteid']) ? intval($_REQUEST['siteid']) : 1;
        $SEO = seo($siteid);

        //搜索配置
        $search_setting = getcache('search');
        $setting = $search_setting[$siteid];

        $search_model = getcache('search_model_'.$siteid);
        $type_module = getcache('type_module_'.$siteid);

        if(isset($_GET['q'])) {
            if(trim($_GET['q'])=='') {
                header('Location: '.APP_PATH.'index.php?m=search');exit;
            }
            $typeid = empty($_GET['typeid']) ? 0 : intval($_GET['typeid']);
            $time = empty($_GET['time']) || !in_array($_GET['time'],array('all','day','month','year','week')) ? 'all' : trim($_GET['time']);
            $page = isset($_GET['page']) ? intval($_GET['page']) : 1;
            $pagesize = 10;
            $q = safe_replace(trim($_GET['q']));
            $q = new_html_special_chars(strip_tags($q));
            $q = str_replace('%', '', $q);    //过滤'%'，用户全文搜索
            $search_q = $q;    //搜索原内容

            $sql_time = $sql_tid = '';
            if($typeid) $sql_tid = ' AND typeid = '.$typeid;
            //按时间搜索
            if($time == 'day') {
                $search_time = SYS_TIME - 86400;
                $sql_time = ' AND adddate > '.$search_time;
            } elseif($time == 'week') {
                $search_time = SYS_TIME - 604800;
                $sql_time = ' AND adddate > '.$search_time;
            } elseif($time == 'month') {
                $search_time = SYS_TIME - 2592000;
                $sql_time = ' AND adddate > '.$search_time;
            } elseif($time == 'year') {
                $search_time = SYS_TIME - 31536000;
                $sql_time = ' AND adddate > '.$search_time;
            } else {
                $search_time = 0;
                $sql_time = '';
            }
            if($page==1 && !$setting['sphinxenable']) {
                //精确搜索
                $commend = $this->db->get_one("`siteid`= '$siteid' $sql_tid $sql_time AND `data` like '%$q%'");
            } else {
                $commend = '';
            }
            //如果开启sphinx
            if($setting['sphinxenable']) {
                $sphinx = pc_base::load_app_class('search_interface', '', 0);
                $sphinx = new search_interface();

                $offset = $pagesize*($page-1);
                $res = $sphinx->search($q, array($siteid), array($typeid), array($search_time, SYS_TIME), $offset, $pagesize, '@weight desc');
                $totalnums = $res['total'];
                //如果结果不为空
                if(!empty($res['matches'])) {
                    $result = $res['matches'];
                }
            } else {

                $sql = "`siteid`= '$siteid' $sql_tid $sql_time AND `data` like '%$q%'";


                $result = $this->db->listinfo($sql, 'searchid DESC', $page, 10);
            }
           var_dump($result);
            //如果结果不为空
            if(!empty($result) || !empty($commend['id'])) {
                foreach($result as $_v) {
                    if($_v['typeid']) $sids[$_v['typeid']][] = $_v['id'];
                }

                if(!empty($commend['id'])) {
                    if($commend['typeid']) $sids[$commend['typeid']][] = $commend['id'];
                }
                $model_type_cache = getcache('type_model_'.$siteid,'search');
                $model_type_cache = array_flip($model_type_cache);
                $data = array();
                foreach($sids as $_k=>$_val) {
                    $tid = $_k;
                    $ids = array_unique($_val);

                    $where = to_sqls($ids, '', 'id');
                    //获取模型id
                    $modelid = $model_type_cache[$tid];

                    //是否读取其他模块接口
                    if($modelid) {
                        $this->content_db->set_model($modelid);

                        /**
                        * 如果表名为空，则为黄页模型
                        */
                        if(empty($this->content_db->model_tablename)) {
                            $this->content_db = pc_base::load_model('yp_content_model');
                            $this->content_db->set_model($modelid);

                        }
                        $datas = $this->content_db->select($where, '*');
                    }
                    $data = array_merge($data,$datas);
                }
                $pages = $this->db->pages;
                $totalnums = $this->db->number;

                //如果分词结果为空
                if(!empty($segment_q)) {
                    $replace = explode(' ', $segment_q);
                    foreach($replace as $replace_arr_v) {
                        $replace_arr[] =  '<font color=red>'.$replace_arr_v.'</font>';
                    }
                    foreach($data as $_k=>$_v) {
                        $data[$_k]['title'] = str_replace($replace, $replace_arr, $_v['title']);
                        $data[$_k]['description'] = str_replace($replace, $replace_arr, $_v['description']);
                    }
                } else {
                    foreach($data as $_k=>$_v) {
                        $data[$_k]['title'] = str_replace($q, '<font color=red>'.$q.'</font>', $_v['title']);
                        $data[$_k]['description'] = str_replace($q, '<font color=red>'.$q.'</font>', $_v['description']);
                    }
                }
            }
            $execute_time = execute_time();
            $pages = isset($pages) ? $pages : '';
            $totalnums = isset($totalnums) ? $totalnums : 0;
            $data = isset($data) ? $data : '';

            include    template('search','list');
        } else {
            include    template('search','index');
        }
    }


    public function public_get_suggest_keyword() {
        $url = $_GET['url'].'&q='.$_GET['q'];
        $trust_url = array('c8430fcf851e85818b546addf5bc4dd3');
        $urm_md5 = md5($url);
        if (!in_array($urm_md5, $trust_url)) exit;

        $res = @file_get_contents($url);
        if(CHARSET != 'gbk') {
            $res = iconv('gbk', CHARSET, $res);
        }
        echo $res;
    }

    /**
     * 提示搜索接口
     * TODO 暂时未启用，用的是google的接口
     */
    public function public_suggest_search() {
        //关键词转换为拼音
        pc_base::load_sys_func('iconv');
        $pinyin = gbk_to_pinyin($q);
        if(is_array($pinyin)) {
            $pinyin = implode('', $pinyin);
        }
        $this->keyword_db = pc_base::load_model('search_keyword_model');
        $suggest = $this->keyword_db->select("pinyin like '$pinyin%'", '*', 10, 'searchnums DESC');

        foreach($suggest as $v) {
            echo $v['keyword']."\n";
        }


    }
}
?>

然后，打开 /phpcms/templates/default/search/header.html 增加一个“不限”的搜索条件，typeid对应的值为0。index.html和lists.html也做相同处理。这样只要不选择模型那么搜索出来的结果就是所有模型中符合条件的数据。