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：
DataReturn.class.php类文件如下：
<?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'; // 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\">\r\n"; echo $this->callback."(".json_encode($this->returnData).");\r\n"; echo "</script>"; } //输出数组格式数据 private function array_return(){ header('content-type:text/html;charset=utf-8'); echo '<pre>'; print_r($this->returnData); echo '</pre>'; } //XML编码 private function xml_encode($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：
<?php require_once('DataReturn.class.php'); $param = array( // DataReturn 参数 'type' => 'JSON', // 输出的类型 JSON,XML,CALLBACK,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 ?>