PHP怎么实现文章分类

这篇文章主要介绍PHP怎么实现文章分类，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

php有什么特点

1、执行速度快。2、具有很好的开放性和可扩展性。3、PHP支持多种主流与非主流的数据库。4、面向对象编程：PHP提供了类和对象。5、版本更新速度快。6、具有丰富的功能。7、可伸缩性。8、功能全面，包括图形处理、编码与解码、压缩文件处理、xml解析等。

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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