php 微信公众号开发之-实现能翻译中英文的公众号

百度翻译api:

http://openapi.baidu.com/public/2.0/bmt/translate?client_id=9peNkh97N6B9GGj9zBke9tGQ&q={$keyword}&from=auto&to=auto

define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
//$wechatObj->valid();
$wechatObj->responseMsg();
class wechatCallbackapiTest
{
	public function valid()
    {
        $echoStr = $_GET["echostr"];

        //valid signature , option
        if($this->checkSignature()){
        	echo $echoStr;
        	exit;
        }
    }

    public function responseMsg()
    {
		//get post data, May be due to the different environments
		$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

      	//extract post data
		if (!empty($postStr)){
                
              	$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
				$type = $postObj->MsgType;
				$customrevent = $postObj->Event;
				$latitude  = $postObj->Location_X;
				$longitude = $postObj->Location_Y;
                $keyword = trim($postObj->Content);
                $time = time();
                $textTpl = "<xml>
							<ToUserName><![CDATA[%s]]></ToUserName>
							<FromUserName><![CDATA[%s]]></FromUserName>
							<CreateTime>%s</CreateTime>
							<MsgType><![CDATA[%s]]></MsgType>
							<Content>%s</Content>
							<FuncFlag>0</FuncFlag>
							</xml>";             
				switch ($type)
			{  
				case "text";
				$tranurl="http://openapi.baidu.com/public/2.0/bmt/translate?client_id=9peNkh97N6B9GGj9zBke9tGQ&q={$keyword}&from=auto&to=auto";//百度翻译地址
                $transtr=file_get_contents($tranurl);//读入文件
				$transon=json_decode($transtr);//json解析
				//print_r($transon);
				$contentStr = $transon->trans_result[0]->dst;//读取翻译内容
                   
				 break;					
			default;
			$contentStr ="此项功能尚未开发";	
			}
				$msgType="text";
				$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
                

        }else {
        	echo "";
        	exit;
        }
    }
		
	private function checkSignature()
	{
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];	
        		
		$token = TOKEN;
		$tmpArr = array($token, $timestamp, $nonce);
		sort($tmpArr);
		$tmpStr = implode( $tmpArr );
		$tmpStr = sha1( $tmpStr );
		
		if( $tmpStr == $signature ){
			return true;
		}else{
			return false;
		}
	}
}