Return data formatting class example implemented by PHP_PHP tutorial

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/**Return data formatting class

* 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'; // Type 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 corresponding name

    $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 ""; 

  } 

  //输出数组格式数据 

  private function array_return(){ 

    header('content-type:text/html;charset=utf-8'); 

    echo '

'; </p>
            <p>    print_r($this->returnData); </p>
            <p>    echo '

  } 

  //XML编码 

  private function xml_encode($data, $root='xmlroot', $encoding='utf-8') { 

    $xml = "n"; 

    $xml.= "<" . $root . ">n"; 

    $xml.= $this->data_to_xml($data); 

    $xml.= ""; 

    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.="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); 

    } 

  } 

  //判断是否需要加上标记 

  private function cdata($val){ 

    if(!empty($val) && !preg_match('/^[A-Za-z0-9+$]/',$val)){ 

      $val = ''; 

    } 

    return $val; 

  } 

}  // class end 

?>