Yii2.0 搜索分页展示（搜索关键字标红）

//控制器

$username = Yii::$app->request->post('username');  //接收搜索的数  
            $where = 1;
            if(!empty($username)){
                $where = " username like '%$username%'";
            }
            $page = Yii::$app->request->post('pages');
            //判断当前页码是否存在
            $pages = isset($page) ? $page : 1 ;
            //计算总条数
            $count = Modi::find()->count();
            //设置每一页显示的条数
            $pageSize = 3 ;
            //计算总页数
            $pageSum = ceil($count/$pageSize);
            //计算偏移量
            $offset = ($pages - 1)*$pageSize;
            //计算上一页 下一页
            $last = $pages<=1 ? 1 : $pages-1 ;
            $next = $pages>=$pageSum ? $pageSum : $pages+1 ;
            //拼接A链接
            $str = '';
            $str .= "<a href='javascript:void(0);' onclick='page(1)'>首页</a>";
            $str .= "<a href='javascript:void(0);' onclick='page($last)'>上一页</a>";
            $str .= "<a href='javascript:void(0);' onclick='page($next)'>下一页</a>";
            $str .= "<a href='javascript:void(0);' onclick='page($pageSum)'>尾页</a>";
            //查询分页后的数据信息
            $sql = "select * from modi where $where limit $offset,$pageSize";
            $userInfo = Modi::findBySql($sql)->asArray()->all();
　　　　     //print_r($userInfo);die;
            //搜索后关键字标红
            foreach($userInfo as $key => $value){
                $userInfo[$key]['username'] = str_replace($username,"<font color='red'>$username</font>",$value['username']);
            }
            return $this->renderPartial('show',['userInfo'=>$userInfo,'page'=>$str]);

//展示页面

<?php echo $page;?>