php类：返回数据格式化类

DataReturn.class.php

<?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';      // 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 對應名稱
        $format['msg'] = $this->exists($param,'format.msg')? $param['format']['msg'] : 'msg';                //msg 對應名稱
        $format['data'] = $this->exists($param,'format.data')? $param['format']['data'] : 'data';            //data 對應名稱  

        $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;
    }  

    //輸出數據
    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格式數據,如有callback參數則返回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格式數據
    private function xml_return(){
        header('content-type:text/xml;charset=utf-8');
        echo $this->xml_encode($this->returnData,$this->xmlroot);
    }  

    //輸出JSON格式數據，并調用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>";
    }  

    //輸出數組格式數據
	// 查看本栏目更多精彩内容：http://www.bianceng.cnhttp://www.bianceng.cn/webkf/PHP/
    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;
    }  

    //數組轉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;
    }  

    //判斷數據是否存在
    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[]]>標記
    private function cdata($val){
        if(!empty($val) && !preg_match('/^[A-Za-z0-9+$]/',$val)){
            $val = '<![CDATA['.$val.']]>';
        }
        return $val;
    }  

}   // class end
?>

demo

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