本文实例讲述了PHP实现的返回数据格式化类及其用法，在字符串处理中非常具有实用价值。分享给大家供大家参考。具体方法如下：
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<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a>
$format['msg'] = $this->exists($param,'format.msg')? $param['format']['msg'] : 'msg'; //msg 对应<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a>
$format['data'] = $this->exists($param,'format.data')? $param['format']['data'] : 'data'; //data 对应<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a>
$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\">\r\n";
echo $this->callback."(".json_encode($this->returnData).");\r\n";
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
?>
demo示例程序如下：
希望本文所述对大家PHP程序设计的学习有所帮助。
