<?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 
?> 

<?php 
  require_once(\'DataReturn.class.php\'); 
  $param = array( // DataReturn 参数 
          \'type\'  => \'JSON\', // 输出的类型 JSON,XML,CALLBACK,ARRAY 默认为 JSON 
          \'retcode\' => \'1000\', // retcode 的值，默认为0 
          \'msg\'   => \'\',   // msg 的值，默认为空 
          \'data\'  => array( // 要输出的数据 
                  \'id\'   => \'100\', 
                  \'name\'  => \'fdipzone\', 
                  \'gender\' => 1, 
                  \'age\'  => 28 
                 ), 
          \'format\' => array( // 输出的数据key格式,默认为 retcode,msg,data 
                  \'retcode\' => \'status\', 
                  \'msg\'   => \'info\', 
                  \'data\'  => \'result\' 
                 ), 
          \'xmlroot\' => \'xmlroot\', // 当type=XML时,XML根节点名称，默认为xmlroot 
          \'callback\' => \'callback\' /* 回调方法名称 
                          type=JSON时，默认为空，如不为空，则输出callback({data}); 
                          type=CALLBACK时,默认为callback，自动调用页面JS回调方法 
                       */ 
  ); 
  $obj = new DataReturn($param); // 创建DataReturn类对象 
  $obj->data_return();      // 按格式输出数据 
?>