php類：返回資料格式化類

DataReturn.class.php

<?php  /** 返回資料格式化類*   Date:   2011-08-15 *   Author: fdipzone */      class DataReturn{   // class start            private $type;      private $xmlroot;      private $callback;      private $returnData;            public function __construct($param=array()){          $this->type = $this->exists($param,'type')? strtoupper($param['type']) : 'JSON';      // 類型 JSON,XML,CALLBACK,ARRAY          $this->xmlroot = $this->exists($param,'xmlroot')? $param['xmlroot'] : 'xmlroot';      // xml root dom name          $this->callback = $this->exists($param,'callback')? $param['callback'] : '';          // JS callback function name                $format = array();          $format['retcode'] = $this->exists($param,'format.retcode')? $param['format']['retcode'] : 'retcode';//retcode 對應名稱          $format['msg'] = $this->exists($param,'format.msg')? $param['format']['msg'] : 'msg';                //msg 對應名稱          $format['data'] = $this->exists($param,'format.data')? $param['format']['data'] : 'data';            //data 對應名稱                $result = array();          $result[$format['retcode']] = $this->exists($param,'retcode')? $param['retcode'] : 0;          $result[$format['msg']] = $this->exists($param,'msg')? $param['msg'] : '';          $result[$format['data']] = $this->exists($param,'data')? $param['data'] : '';                $this->returnData = $result;      }                  //輸出數據      public function data_return(){          ob_clean();          switch($this->type){              case 'JSON':                  $this->json_return();                  break;              case 'XML':                  $this->xml_return();                  break;              case 'CALLBACK':                  $this->callback_return();                  break;              case 'ARRAY':                  $this->array_return();                  break;              default:                  $this->json_return();          }          exit();      }                  //輸出JSON格式數據,如有callback參數則返回JSONP格式      private function json_return(){          header('content-type:text/html;charset=utf-8');          if(empty($this->callback)){              echo json_encode($this->returnData);          }else{              echo $this->callback.'('.json_encode($this->returnData).');';          }      }                  //輸出XML格式數據      private function xml_return(){          header('content-type:text/xml;charset=utf-8');          echo $this->xml_encode($this->returnData,$this->xmlroot);      }                  //輸出JSON格式數據，並調用callback方法      private function callback_return(){          header('content-type:text/html;charset=utf-8');          $this->callback = empty($this->callback)? 'callback' : $this->callback;          echo "<script type=\"text/javascript\">\r\n";        echo $this->callback."(".json_encode($this->returnData).");\r\n";          echo "</script>";      }                  //輸出數組格式數據 // 查看本欄目更多精彩內容：http://www.bianceng.cnhttp://www.bianceng.cn/webkf/PHP/    private function array_return(){          header('content-type:text/html;charset=utf-8');          echo '<pre>';          print_r($this->returnData);          echo '</pre>';      }                  //XML編碼      private function xml_encode($data, $root='xmlroot', $encoding='utf-8') {          $xml = "<?xml version=\"1.0\" encoding=\"" . $encoding . "\"?>\n";        $xml.= "<" . $root . ">\n";          $xml.= $this->data_to_xml($data);          $xml.= "</" . $root . ">";          return $xml;      }                  //數組轉XML格式      private function data_to_xml($data) {          if (is_object($data)) {              $data = get_object_vars($data);          }          $xml = '';          foreach ($data as $key => $val) {              is_numeric($key) && $key = "item id=\"$key\"";            $xml.="<$key>";              $xml.= ( is_array($val) || is_object($val)) ? $this->data_to_xml($val) : $this->cdata($val);              list($key, ) = explode(' ', $key);              $xml.="</$key>\n";          }          return $xml;      }                  //判斷數據是否存在      private function exists($obj,$key=''){          if($key==''){              return isset($obj) && !empty($obj);          }else{              $keys = explode('.',$key);              for($i=0,$max=count($keys); $i<$max; $i++){                  if(isset($obj[$keys[$i]])){                      $obj = $obj[$keys[$i]];                  }else{                      return false;                  }              }              return isset($obj) && !empty($obj);          }      }                  //判斷是否需要加上<![CDATA[]]>標記      private function cdata($val){          if(!empty($val) && !preg_match('/^[A-Za-z0-9+$]/',$val)){              $val = '<![CDATA['.$val.']]>';          }          return $val;      }        }   // class end  ?>

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