本文實(shí)例講述了php實(shí)現(xiàn)的返回?cái)?shù)據(jù)格式化類及其用法，在字符串處理中非常具有實(shí)用價(jià)值。分享給大家供大家參考。具體方法如下：

DataReturn.class.php類文件如下：

<?php /** 返回?cái)?shù)據(jù)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(duì)應(yīng)名稱     $format['msg'] = $this->exists($param,'format.msg')? $param['format']['msg'] : 'msg';        //msg 對(duì)應(yīng)名稱     $format['data'] = $this->exists($param,'format.data')? $param['format']['data'] : 'data';      //data 對(duì)應(yīng)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 = $result;   }    //輸出數(shù)據(jù)   public function data_return(){     ob_clean();     switch($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:         $this->json_return();     }     exit();   }    //輸出JSON格式數(shù)據(jù),如有callback參數(shù)則返回JSONP格式   private function json_return(){     header('content-type:text/html;charset=utf-8');     if(empty($this->callback)){       echo json_encode($this->returnData);     }else{       echo $this->callback.'('.json_encode($this->returnData).');';     }   }    //輸出XML格式數(shù)據(jù)   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(shù)據(jù)，并調(diào)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(shù)組格式數(shù)據(jù)   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 $xml;   }    //數(shù)組轉(zhuǎn)XML格式   private function data_to_xml($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 $xml;   }    //判斷數(shù)據(jù)是否存在   private function exists($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($obj);     }   }    //判斷是否需要加上<![CDATA[]]>標(biāo)記   private function cdata($val){     if(!empty($val) && !preg_match('/^[A-Za-z0-9+$]/',$val)){       $val = '<![CDATA['.$val.']]>';     }     return $val;   } }  // class end ?> 

demo示例程序如下：

<?php   require_once('DataReturn.class.php');   $param = array( // DataReturn 參數(shù)           'type'  => 'JSON', // 輸出的類型 JSON,XML,CALLBACK,ARRAY 默認(rèn)為 JSON           'retcode' => '1000', // retcode 的值，默認(rèn)為0           'msg'   => '',   // msg 的值，默認(rèn)為空           'data'  => array( // 要輸出的數(shù)據(jù)                   'id'   => '100',                   'name'  => 'fdipzone',                   'gender' => 1,                   'age'  => 28                  ),           'format' => array( // 輸出的數(shù)據(jù)key格式,默認(rèn)為 retcode,msg,data                   'retcode' => 'status',                   'msg'   => 'info',                   'data'  => 'result'                  ),           'xmlroot' => 'xmlroot', // 當(dāng)type=XML時(shí),XML根節(jié)點(diǎn)名稱，默認(rèn)為xmlroot           'callback' => 'callback' /* 回調(diào)方法名稱                           type=JSON時(shí)，默認(rèn)為空，如不為空，則輸出callback({data});                           type=CALLBACK時(shí),默認(rèn)為callback，自動(dòng)調(diào)用頁(yè)面JS回調(diào)方法                        */   );   $obj = new DataReturn($param); // 創(chuàng)建DataReturn類對(duì)象   $obj->data_return();      // 按格式輸出數(shù)據(jù) ?>

希望本文所述對(duì)大家php程序設(shè)計(jì)的學(xué)習(xí)有所幫助。

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