<?php
class Wechat { private $data = array();
 public function __construct($token){ $this->auth($token) || exit;
 if(IS_GET){ echo($_GET['echostr']);
exit;
 } else { $xml = file_get_contents("php://input");
 $xml = new SimpleXMLElement($xml);
 $xml || exit;
 foreach ($xml as $key => $value) { $this->data[$key] = strval($value);
 } } }
 public function request(){ return $this->data;
 }
 public function response($content, $type = 'text', $flag = 0){ $this->data = array( 'ToUserName' => $this->data['FromUserName'], 'FromUserName' => $this->data['ToUserName'], 'CreateTime' => NOW_TIME, 'MsgType' => $type, );
 $this->$type($content);
 $this->data['FuncFlag'] = $flag;
 $xml = new SimpleXMLElement('<xml></xml>');
 $this->data2xml($xml, $this->data);
 exit($xml->asXML());
 }
 private function text($content){ $this->data['Content'] = $content;
 }
 private function music($music){ list( $music['Title'], $music['Description'], $music['MusicUrl'], $music['HQMusicUrl'] ) = $music;
 $this->data['Music'] = $music;
 }
 private function news($news){ $articles = array();
 foreach ($news as $key => $value) { list( $articles[$key]['Title'], $articles[$key]['Description'], $articles[$key]['PicUrl'],$articles[$key]['Url'] ) = $value;
 if($key >= 9) { break;
 } } $this->data['ArticleCount'] = count($articles);
 $this->data['Articles'] = $articles;
 }
 private function data2xml($xml, $data, $item = 'item') { foreach ($data as $key => $value) { is_numeric($key) && $key = $item;
 if(is_array($value) || is_object($value)){ $child = $xml->addChild($key);
 $this->data2xml($child, $value, $item);
 } else { if(is_numeric($value)){ $child = $xml->addChild($key, $value);
 } else { $child = $xml->addChild($key);
 $node = dom_import_simplexml($child);
 $node->appendChild($node->ownerDocument->createCDATASection($value));
 } } } }
 private function auth($token){ $data = array($_GET['timestamp'], $_GET['nonce'], $token);
 $sign = $_GET['signature'];
 sort($data,SORT_STRING);
 $signature = sha1(implode($data));
 return $signature === $sign;
 } }
?>