/**  * 獲得樹狀數據  * @param $data 數據  * @param $title    數據庫中字段名  * @param string $fieldPri  數據庫中主鍵id  * @param string $fieldPid  數據庫中父id  * @return array  */ static public function tree($data, $title, $fieldPri = 'cid', $fieldPid = 'pid') {  if (!is_array($data) || empty($data))   return array();  $arr = Data::channelList($data);  foreach ($arr as $k => $v) {   $str = "";   if ($v['_level'] > 2) {    for ($i = 1; $i < $v['_level'] - 1; $i++) {     $str .= "│ ";    }   }   if ($v['_level'] != 1) {    $t = $title ? $v[$title] : "";    if (isset($arr[$k + 1]) && $arr[$k + 1]['_level'] >= $arr[$k]['_level']) {     $arr[$k]['_name'] = $str . "├─ " . $v['_html'] . $t;    } else {     $arr[$k]['_name'] = $str . "└─ " . $v['_html'] . $t;    }   } else {    $arr[$k]['_name'] = $v[$title];   }  }  //設置主鍵為$fieldPri  $data = array();  foreach ($arr as $d) {   $data[$d[$fieldPri]] = $d;  }  return $data; }

/**  * 獲得所有子欄目  * @param $data 欄目數據  * @param int $pid 操作的欄目  * @param string $html 欄目名前字符  * @param string $fieldPri 表主鍵  * @param string $fieldPid 父id  * @param int $level 等級  * @return array  */ static public function channelList($data, $pid = 0, $html = " ", $fieldPri = 'cid', $fieldPid = 'pid', $level = 1) {  $data = self::_channelList($data, $pid, $html, $fieldPri, $fieldPid, $level);  if (empty($data))   return $data;   foreach ($data as $n => $m) {   if ($m['_level'] == 1)    continue;//結束單次循環   $data[$n]['_first'] = false;   $data[$n]['_end'] = false;   if (!isset($data[$n - 1]) || $data[$n - 1]['_level'] != $m['_level']) {    $data[$n]['_first'] = true;    }   if (isset($data[$n + 1]) && $data[$n]['_level'] > $data[$n + 1]['_level']) {    $data[$n]['_end'] = true;   }  }  //更新key為欄目主鍵  $category=array();  foreach($data as $d){   $category[$d[$fieldPri]]=$d;  }  return $category; }

//只供channelList方法使用  /**  * 獲得所有子欄目  * @param $data 欄目數據  * @param int $pid 操作的欄目  * @param string $html 欄目名前字符  * @param string $fieldPri 表主鍵  * @param string $fieldPid 父id  * @param int $level 等級  * @return array  */ static private function _channelList($data, $pid = 0, $html = " ", $fieldPri = 'cid', $fieldPid = 'pid', $level = 1) {  if (empty($data))   return array();  $arr = array();   foreach ($data as $v) {   $id = $v[$fieldPri];   if ($v[$fieldPid] == $pid) {    $v['_level'] = $level;    $v['_html'] = str_repeat($html, $level - 1);    $arr[] = $v;     $tmp = self::_channelList($data, $id, $html, $fieldPri, $fieldPid, $level + 1);    $arr = array_merge($arr, $tmp);//array_merge把兩個數組整合為一個數組   }  }  return $arr; }