ThinkPHP5無限循環輸出無限分類【方案二】

數據庫設計

DROP TABLE IF EXISTS `think_category`;
CREATE TABLE `think_category` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '分類ID',
  `pid` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '上級分類ID',
  `name` varchar(50) NOT NULL COMMENT '分類名稱',
  `type` tinyint(1) unsigned NOT NULL DEFAULT '1' COMMENT '分類類型  1  列表  2 單頁',
  `sort` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT '排序',
  PRIMARY KEY (`id`),
  UNIQUE KEY `name` (`name`) USING BTREE
) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COMMENT='分類表';

模型

public function getLevelList() {
   $category_level = $this->order(['sort' => 'DESC', 'id' => 'ASC'])->select();
    return array2level($category_level);
}

分類的添加

protected $category_model;
protected $article_model;

protected function _initialize() {
  parent::_initialize();
  $this->category_model = new CategoryModel();
  $category_level_list  = $this->category_model->getLevelList();

  $this->assign('category_level_list', $category_level_list);
}

public function save() {
   $data = $this->request->post();
   if ($this->category_model->allowField(true)->save($data)) {
     $this->success('保存成功');
   }else {
     $this->error('保存失敗');
   }
}

/**
 * 編輯欄目
 * @param $id
 * @return mixed
 */
public function edit($id) {
    $category = $this->category_model->find($id);

    return $this->fetch('edit', ['category' => $category]);
}

html代碼欄目選擇部分，其餘都是<input>標籤

<div class="layui-form-item">
    <label class="layui-form-label">上級欄目</label>
    <div class="layui-input-block">
        <select name="pid" lay-verify="required">
            <option value="0">一級欄目</option>
            {foreach name="category_level_list" item="vo"}
            <option value="{$vo.id}" {if condition="$pid==$vo.id"} selected="selected"{/if}>
              {neq name="vo.level" value="1"}
               |{php}
                 for($i=1;$i<$vo['level'];$i++)
                   {echo ' ----';}
               {/php}
             {/neq} {$vo.name}</option>
            {/foreach}
        </select>
    </div>
</div>

用到的函數common.php

<?php

/**
 * 數組層級縮進轉換
 * @param array $array
 * @param int   $pid
 * @param int   $level
 * @return array
 */
function array2level($array, $pid = 0, $level = 1) {
    static $list = [];
    foreach ($array as $v) {
        if ($v['pid'] == $pid) {
            $v['level'] = $level;
            $list[]     = $v;
            array2level($array, $v['id'], $level + 1);
        }
    }

    return $list;
}

/**
 * 構建層級（樹狀）數組
 * @param array  $array 要進行處理的一維數組，通過該函數處理後，該數組自動轉爲樹狀數組
 * @param string $pid 父級ID的字段名
 * @param string $child_key_name 子元素鍵名
 * @return array|bool
 */
function array2tree(&$array, $pid = 'pid', $child_key_name = 'children') {
    $counter = array_children_count($array, $pid);
    if ($counter[0] == 0)
        return false;
    $tree = [];
    while (isset($counter[0]) && $counter[0] > 0) {
        $temp = array_shift($array);
        if (isset($counter[$temp['id']]) && $counter[$temp['id']] > 0) {
            array_push($array, $temp);
        } else {
            if ($temp[$pid] == 0) {
                $tree[] = $temp;
            } else {
                $array = array_child_append($array, $temp[$pid], $temp, $child_key_name);
            }
        }
        $counter = array_children_count($array, $pid);
    }

    return $tree;
}

/**
 * 子元素計數器
 * @param $array
 * @param $pid
 * @return array
 */
function array_children_count($array, $pid) {
    $counter = [];
    foreach ($array as $item) {
        $count = isset($counter[$item[$pid]]) ? $counter[$item[$pid]] : 0;
        $count++;
        $counter[$item[$pid]] = $count;
    }

    return $counter;
}

/**
 * 把元素插入到對應的父元素$child_key_name字段
 * @param        $parent
 * @param        $pid
 * @param        $child
 * @param string $child_key_name 子元素鍵名
 * @return mixed
 */
function array_child_append($parent, $pid, $child, $child_key_name) {
    foreach ($parent as &$item) {
        if ($item['id'] == $pid) {
            if (!isset($item[$child_key_name]))
                $item[$child_key_name] = [];
            $item[$child_key_name][] = $child;
        }
    }

    return $parent;
}

/**
 * 循環刪除目錄和文件
 * @param string $dir_name
 * @return bool
 */
function delete_dir_file($dir_name) {
    $result = false;
    if(is_dir($dir_name)){
        if ($handle = opendir($dir_name)) {
            while (false !== ($item = readdir($handle))) {
                if ($item != '.' && $item != '..') {
                    if (is_dir($dir_name . DS . $item)) {
                        delete_dir_file($dir_name . DS . $item);
                    } else {
                        unlink($dir_name . DS . $item);
                    }
                }
            }
            closedir($handle);
            if (rmdir($dir_name)) {
                $result = true;
            }
        }
    }

    return $result;
}

/**
 * 判斷是否爲手機訪問
 * @return  boolean
 */
function is_mobile() {
    static $is_mobile;

    if (isset($is_mobile)) {
        return $is_mobile;
    }

    if (empty($_SERVER['HTTP_USER_AGENT'])) {
        $is_mobile = false;
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Mobile') !== false
              || strpos($_SERVER['HTTP_USER_AGENT'], 'Android') !== false
              || strpos($_SERVER['HTTP_USER_AGENT'], 'Silk/') !== false
              || strpos($_SERVER['HTTP_USER_AGENT'], 'Kindle') !== false
              || strpos($_SERVER['HTTP_USER_AGENT'], 'BlackBerry') !== false
              || strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mini') !== false
              || strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mobi') !== false
    ) {
        $is_mobile = true;
    } else {
        $is_mobile = false;
    }

    return $is_mobile;
}