PHP如何实现文章分类

文章分类：同一个新闻 属于 多个菜单项 。比如某新闻既属于校园新闻又属于机构设置，那么点开校园新闻菜单项可以看到这篇文章，点开机构设置也可以看到这篇文章。

两个数据库 type放菜单项 每个菜单项的id唯一。dynamics放文章，文章的tag可以是多个type中的id

public function column($p=1){
        $school_dynamicsModel = D('school_dynamics');
        $school_typeModel =D('school_type');
        $photoModel =D('photo');
        $pid = isset($_REQUEST['pid']) ? $_REQUEST['pid'] : false;
        $p = intval($p) > 0 ? $p : 1;
        $pagesize = 20;
        $offset = $pagesize * ($p - 1);
        
        $count = $school_dynamicsModel->where("tag like '%' '$pid' '%' and is_delete = 0")->count();
        $list_school = $school_dynamicsModel->where("tag like '%' '$pid' '%' and is_delete = 0")->order('time desc ')->limit($offset . ',' . $pagesize)->select();
        $list = array();

        foreach ($list_school as $p) {
            if ($p['release_date']) {
                $p['time'] = $p['release_date'];
            }
            else {
                $p['time'] = date('Y-m-d H:i:s', $p['time']);
            }
            $list[] = $p;
        }

        
        $this->assign('list',$list);
        $this->assign('page', $page);
        $this->display();
    }

然后在页面上循环输出

 <p class="items-content">
    <ul class="article">
         <volist name="list" id="val">
              <li>
                  <a href="/home/index/column_form.html?id={$val.id} ">
                      <span>{$val.title}</span><strong>{$val.time}</strong>
                   </a>
               </li>
          </volist>
      </ul>
       <p class="pages">
          {$page}
        </p>
</p>

当你点击页面上的修改或者新增或者修改时，input把tag中的对应的菜单项读出来

 public function edit($aid = 0){
        $aid = intval($aid);
        $school_dynamicsModel = D('school_dynamics');
        $item = $school_dynamicsModel->where("id='$aid'")->find();
        $conditions=$item['tag'];
        $character_string=explode(',',$conditions);
        
        for($cycle=0;$cycle<count($character_string);$cycle++) {
	        $record = D('school_type')->where("id ='$character_string[$cycle]'")->find();
	        $recordtag[]=$record['title'];
        }
        
        $tag=implode(',',$recordtag);
	    $item['tag']= $tag;
	    
        if (!$item) {
            $this->error('参数错误！');
        }
        
        $option = M('school_type')->order('sort ASC')->select();
        $option = $this->getMenu($option);
        $this->assign('option', $option);
	    $this->assign('tag', $tag);
        $this->assign('item', $item);
        $this->display('form');
    }

    public function update(){
    	
		    $id = isset($_REQUEST['id']) ? $_REQUEST['id'] : false;
                
            $data['tag'] = $_POST['titietag'];

		    $tag_str = $data['tag'];
		    $array_tag = explode(',',$tag_str);
			
		    for ($cyclic_variable = 0; $cyclic_variable < count($array_tag);                                       $cyclic_variable++) {
			
			   
			    $result = D('school_type')->where("title='$array_tag[$cyclic_variable]'")->find();

			    $record_id[] = $result['id'];
			   
		    }
		    $char = implode(',', $record_id);
	   
		    $data['tag'] = $char;             

		    if ($id) {
			    D('school_dynamics')->data($data)->where('id=' . $id)->save();
			    addlog('编辑内容，ID：' . $id);
			    $this->success('恭喜！内容编辑成功！', U('/qwadmin/homepage/index'));
		    } else {

			    $result = D('school_dynamics')->data($data)->add();
			    if ($result) {
				    addlog('新增内容，ID：' . $result['id']);
				    $this->success('恭喜！内容新增成功！', U('/qwadmin/homepage/index'));
			    } else {
				    $this->error('抱歉，未知错误！');
			    }
		    }
	    }

网页代码

 
                            <div class="form-group">
                                <label class="col-sm-1 control-label no-padding-right" for="form-field-1">
                                    文章类目： </label>
                                <div class="col-sm-9">
                                    <select id="xinzen" name="xinzen" class="rcol-xs-10 col-sm-5">
 
                                        <volist name="option" id="v">
                                            <option value="{$v.id}"
 
                                            >{$v['title']}</option>
                                            <volist name="v.children" id="vv">
                                                <option value="{$vv.id}"
 
                                                >{$vv['title']}</option>
                                            </volist>
                                        </volist>
                                    </select>
 
                                    <span class="help-inline col-xs-12 col-sm-7">
                                          <span class="middle">
                                              <input type="button" value="新增" onclick="toTag()">
                                          </span>
                                   </span>
                                </div>
                            </div>
 
<script>
 function toTag() {
 
     var originally_input=$("#titletag").val();
     $("#titletag").val("");
     var add_new=$("#xinzen option:selected").text();
 
     if (originally_input.indexOf(add_new, 0) == -1) {
         if(originally_input==''){
          originally_input = add_new;
     }else{
         originally_input += ',' + add_new;
      }
      $("#titletag").val(originally_input);
       } else {
            $("#titletag").val(originally_input);
       }
   }                               
</script>

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