php实现的返回数据格式化类实例

本文实例讲述了php实现的返回数据格式化类及其用法，在字符串处理中非常具有实用价值。分享给大家供大家参考。具体方法如下：

DataReturn.class.php类文件如下：

<?php /** 返回数据格式化类 *  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';   // 类型 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 对应名称     $format['msg'] = $this->exists($param,'format.msg')? $param['format']['msg'] : 'msg';        //msg 对应名称     $format['data'] = $this->exists($param,'format.data')? $param['format']['data'] : 'data';      //data 对应名称      $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 = $result;   }    //输出数据   public function data_return(){     ob_clean();     switch($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:         $this->json_return();     }     exit();   }    //输出JSON格式数据,如有callback参数则返回JSONP格式   private function json_return(){     header('content-type:text/html;charset=utf-8');     if(empty($this->callback)){       echo json_encode($this->returnData);     }else{       echo $this->callback.'('.json_encode($this->returnData).');';     }   }    //输出XML格式数据   private function xml_return(){     header('content-type:text/xml;charset=utf-8');     echo $this->xml_encode($this->returnData,$this->xmlroot);   }    //输出JSON格式数据，并调用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>";   }    //输出数组格式数据   private function array_return(){     header('content-type:text/html;charset=utf-8');     echo '<pre>';     print_r($this->returnData);     echo '</pre>';   }    //XML编码   private function xml_encode($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 $xml;   }    //数组转XML格式   private function data_to_xml($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 $xml;   }    //判断数据是否存在   private function exists($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($obj);     }   }    //判断是否需要加上<![CDATA[]]>标记   private function cdata($val){     if(!empty($val) && !preg_match('/^[A-Za-z0-9+$]/',$val)){       $val = '<![CDATA['.$val.']]>';     }     return $val;   } }  // class end ?>