php实现的返回数据格式化类实例

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">rn";
echo $this->callback."(".json_encode($this->returnData).");rn";
echo "";
}

//输出数组格式数据
private function array_return(){
header('content-type:text/html;charset=utf-8');
echo '

';

print_r($this->returnData);

echo '

';
}

//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
?>

'JSON',// 输出的类型 JSON,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 ?>