The return data format class instance of PHP implementation

The DataReturn.class.php class files are as follows:

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<?php /** return Data format class   *  date:  2011-08-15  *  author:fdipzone  */   &nb sp;  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 corresponding name         $format [' data '] = $this->exists ($param, ' Format.data ')? $param [' Format '] [' data ']: ' Data ';     //data corresponding name             $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 = $result;     }        //Output Data     public function Data_return () {      ob_clean ();       switch ($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:           $this->json_return ();      }       exit ();    }        //output JSON format data, if callback parameter returns JSONP format     private function Json_return () {      header (' content-type:text/html; Charset=utf-8 ');      if (Empty ($this->callback)) {         echo Json_encode ($this->returndata);      }else{         echo $this->callback. ' ('. Json_encode ($this->returndata); ';       }    }        //output XML Format data      private function Xml_return () {      header (' content-type:text/xml;charset=utf-8 ');       echo $this->xml_encode ($this->returndata, $this->xmlroot);     }        //output JSON format data and invoke callback method     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 ">rn";       echo $this->callback. " (". Json_encode ($this->returndata)."); RN ";      echo" </script> ";    }         //output Array Format data     private function Array_return () {      header (' Content-type:text/html;charset=utf-8 ');      echo ' <pre> ';       print_r ($this->returndata);      echo ' </pre> ';    }         //xml code     private function Xml_encode ($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 $xml;    }        // Array conversion XML format     private function data_to_xml ($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 $xml;    }        // Determine whether the data exists     private function exists ($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);      }    }        //to determine whether the need to add <! [cdata[]]> tags     private function CDATA ($val) {      if (!empty ($val) & &!preg_match ('/^[a-za-z0-9+$]/', $val)) {         $val = ' <![ Cdata['. $val. ']]> ';      }      return $val;     } } //class end ?>

The Demo sample program is as follows:

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<?php    require_once (' DataReturn.class.php ');     $param = Array (//DataReturn Parameters & nbsp            ' type '   => ' JSON ',//output types Json,xml,callback, ARRAY defaults to json             ' retcode ' => ' 1000 ',//Retcode values , the default is 0             ' msg '    => ',  / MSG value, default to null              ' data '   => Array (///to Output                       ' id '    => ',                      ' name '   => ' fdipzone ',                      ' Gender ' => 1,                      ' age '   => 28                    ),             ' format ' => array (//Output Data key format, default to retcode,msg,data                      ' Retcode ' => ' status ',                      ' msg '    => ' info ',                     ' Data '   => ' result '                     ),             ' xmlroot ' => ' XmlrOot ',//when type=xml, XML root node name, default xmlroot             ' Callback ' => ' callback '/* callback method name                When               type=json, the default is null, if not empty, The output callback ({data});                 When             type=callback, the default is callback, Automatically call page JS callback method                           */    );     $obj = new DataReturn ($ param); Create DataReturn class objects      $obj->data_return ();     //output data in format  ?>