PHP WeChat API access and keyword automatic reply

<?php  
namespace Home\Controller;  
use Think\Controller;  
class IndexController extends Controller {  
    public function index(){  
        $timestamp = $_GET[&#39;timestamp&#39;];//timestamp其实就是一个时间戳  
        $nonce     = $_GET[&#39;nonce&#39;];//nonce是一个随机参数  
        $token     = "weixin";//这个token填写你在微信公众平台上写的那个值  
        $signature = $_GET[&#39;signature&#39;];//这个signature其实就是在微信公众平台已经加密好的字符串  
        $echostr   = $_GET[&#39;echostr&#39;];  
        $array     = array( $timestamp, $nonce, $token);  
        sort($array);  
  
        $tmpstr = implode(&#39;&#39;, $array);  
        $tmpstr = sha1($tmpstr);  
  
    if( $tmpstr == $signature && $echostr){  
      
            echo $echostr;  
            exit;  
        }else{  
            $this->reponseMsg();  
        }  
    }  
    public function reponseMsg(){  
        $postArr = $GLOBALS[&#39;HTTP_RAW_POST_DATA&#39;];  
        $postObj = simplexml_load_string( $postArr );  
        if( strtolower( $postObj->MsgType) == &#39;event&#39;){  
            //如果是关注事件(subscribe)  
            if( strtolower($postObj->Event == &#39;subscribe&#39;) ){  
                //回复用户消息  
                $toUser   = $postObj->FromUserName;  
                $fromUser = $postObj->ToUserName;  
                $time     = time();  
                $msgType  =  &#39;text&#39;;  
                $content  = &#39;欢迎关注 书旅and良玉 微信公众账号&#39;.$postObj->FromUserName.&#39;-&#39;.$postObj->ToUserName;  
                $template = "<xml>  
                            <ToUserName><![CDATA[%s]]></ToUserName>  
                            <FromUserName><![CDATA[%s]]></FromUserName>  
                            <CreateTime>%s</CreateTime>  
                            <MsgType><![CDATA[%s]]></MsgType>  
                            <Content><![CDATA[%s]]></Content>  
                            </xml>";  
                $info     = sprintf($template, $toUser, $fromUser, $time, $msgType, $content);  
                echo $info;  
            }  
        }  
//回复纯文本或单图文消息  
        if(($postObj->MsgType) == &#39;text&#39; && trim($postObj->Content) == &#39;夏目友人帐&#39;){  
            $toUser   = $postObj->FromUserName;  
            $fromUser = $postObj->ToUserName;  
            $arr = array(  
                array(  
                    &#39;title&#39;=>&#39;夏目友人帐&#39;,  
                    &#39;description&#39;=>"此生无悔入夏目",  
                    &#39;picUrl&#39;=>&#39;http://img4.duitang.com/uploads/item/201508/16/20150816015528_X8dKY.jpeg&#39;,  
                    &#39;url&#39;=>&#39;http://www.shulvchen.cn&#39;,  
                ),  
            );    
            $template = "<xml>  
                        <ToUserName><![CDATA[%s]]></ToUserName>  
                        <FromUserName><![CDATA[%s]]></FromUserName>  
                        <CreateTime>%s</CreateTime>  
                        <MsgType><![CDATA[%s]]></MsgType>  
                        <ArticleCount>".count($arr)."</ArticleCount>  
                        <Articles>";  
            foreach($arr as $k=>$v){  
                $template .="<item>  
                            <Title><![CDATA[".$v[&#39;title&#39;]."]]></Title>   
                            <Description><![CDATA[".$v[&#39;description&#39;]."]]></Description>  
                            <PicUrl><![CDATA[".$v[&#39;picUrl&#39;]."]]></PicUrl>  
                            <Url><![CDATA[".$v[&#39;url&#39;]."]]></Url>  
                            </item>";  
            }  
            $template .="</Articles>  
                        </xml> ";  
            echo sprintf($template, $toUser, $fromUser, time(), &#39;news&#39;);  
        }else{  
            switch( trim($postObj->Content) ){  
                case &#39;bb&#39;:  
                    $content = &#39;我喜欢你&#39;;  
                break;  
                case &#39;良玉&#39;:  
                    $content = &#39;我喜欢你&#39;;  
                break;  
                case &#39;书旅&#39;:  
                    $content = &#39;加油&#39;;  
                break;  
                case &#39;dsdf&#39;:  
                    $content = &#39;不愿错过他&#39;;  
                break;  
                case &#39;垒哥&#39;:  
                    $content = &#39;垒哥已死，有事儿烧纸&#39;;  
                break;  
                case &#39;书旅and良玉&#39;:  
                    $content = &#39;Forever with you&#39;;  
                break;  
                case &#39;学弟&#39;:  
                    $content = &#39;书旅是你学长&#39;;  
                break;  
                default:  
                    $content = "<a href=&#39;http://www.baidu.com&#39;>百度一下，你就知道(点击文字，进入百度)</a>";  
  
            }     
                $template1 = "<xml>  
                            <ToUserName><![CDATA[%s]]></ToUserName>  
                            <FromUserName><![CDATA[%s]]></FromUserName>  
                            <CreateTime>%s</CreateTime>  
                            <MsgType><![CDATA[%s]]></MsgType>  
                            <Content><![CDATA[%s]]></Content>  
                            </xml>";  
                $fromUser = $postObj->ToUserName;//消息从哪里来  
                $toUser   = $postObj->FromUserName;//发送给谁  
                $time     = time();   
                //$content  = &#39;我喜欢你&#39;;  
                $msgType  = &#39;text&#39;;  
                echo sprintf($template1, $toUser, $fromUser,$time, $msgType, $content);  
        }  
    }     
}