<?php namespace HomeController;use ThinkController;define("TOKEN","weixin");/* *WeChat's entry file */class WechatController extends Controller { {code...} }?>

if ($_GET['echostr'] != NULL ) { echo $_GET['echostr']; exit; } 对接的时候打印一下post和get。。不会没有的
java - PHP development WeChat cannot obtain signature, timestamp, nonce-PHP Chinese Network Q&A

<?php
namespace HomeController;
use ThinkController;
define("TOKEN","weixin");
/*
*WeChat entry file
* /
class WechatController extends Controller {

protected $User;     //微信用户对象 
protected $app_id; 
protected $secret;

/*通用入口 构造方法
 *aunthor:caodi
 *date:2015-09-25
 */
public function _initialize() {
    $this->app_id = C("APPID");
    $this->secret = C("APPSECRET");
}

/*微信入口
 *author:caodi
 *date:2015-09-22
 */
public function wechat() {
    DLOG("微信入口记录的时间","run","caodi");
    if ($_GET['echostr'] != NULL ) {  
        echo $_GET['echostr'];
        exit;
    }
    //微信只会在第一次在URL中带echostr参数，以后就不会带这个参数了
    if ($this->checkSignature()) { //success!
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        //extract post data
        if (!empty($postStr)) {
            libxml_disable_entity_loader(true);
            $postObj = simplexml_load_string($postStr,"SimpleXMLElement",LIBXML_NOCDATA);
            $this->$User = $postObj;
            //根据消息类型将信息分发
            $this->route($postObj);
            //exit;

            //以下为测试用的
            $toUsername = $postObj->ToUserName;
            $fromUsername = $postObj->FromUserName;
            $keyword = trim($postObj->Content);
            $msyType = trim($postObj->MsgType); //消息类型
            $event = trim($postObj->Event); //事件类型
            $time = time();
            $result = json_encode($postObj);
            DLOG("消息的参数".$result,"run","caodi");
            $textTpl = "<xml>
                        <ToUserName><![CDATA[%s]]></ToUserName>
                        <FromUserName><![CDATA[%s]]></FromUserName>
                        <CreateTime>%s</CreateTime>
                        <MsgType><![CDATA[%s]]></MsgType>
                        <Content><![CDATA[%s]]></Content>
                        <FuncFlag>0</FuncFlag>
                        </xml>";
            if ($event == "subscribe") {
                $msgType = "text";
                $contentStr = date("Y-m-d H:i:s",time());
                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
            }
        }
    } else {
        echo "error";
    }
}

/*wechat身份验证
 *author:caodi
 *date:2015-09-22
 */
public function checkSignature() {
    //you must define TOKEN by yourself
    
    if (!defined("TOKEN")) {
        throw new Exception("TOKEN is not defined!");
    }
    $nonce     = $_GET["nonce"];
    $token = TOKEN;
    $timestamp = $_GET["timestamp"];
    $signature = $_GET["signature"];
    
   
    echo $signature."<br/>";
    echo $timestamp."<br/>";
    echo $nonce."<br/>";

    
    $tmpArr = array($token,$timestamp,$nonce);
    sort($tmpArr,SORT_STRING);
    $tmpStr = implode($tmpArr);
    $tmpStr = sha1($tmpStr);
    if ($tmpStr == $signature) {
        return true;
        echo "true";
    } else {
        return false;
        echo "false";
    }

}

/*根据微信的消息类型来进行的分发
 *author:caodi
 *date:2015-09-23
 */
public function route($postObj) {
    $msgType = trim($postObj->MsgType);
    DLOG("mygtype=".$msgType,"run","caodi");
    switch ($msgType) {
        //(1)接受的为消息推送
        case "text":
            $this->reponse_text($postObj);
            break;
        case "image":
            $this->reponse_image($postObj);
            break;
        case "voice":
            $this->reponse_voice($postObj);
            break;
        //(2)接受的为事件推送
        case "event":
            $event = $postObj->Event;
            DLOG("event=".$event,"run","caodi");
            switch ($event) {
                case "subscribe":
                    $this->subscribe($postObj);
                    break;
                case "unsubscribe":
                    $this->unsubscribe($postObj);
                    break;
                //自定义菜单的事件功能
            }

    }
}

/*微信用户关注微信号事件(获取用户的基本信息存入到用户表中去)
 *author:caodi
 *date:2015-09-23
 */
public function subscribe($postObj) {
    $open_id = $postObj->FromUserName;
    $create_time = $postObj->CreateTime;
    $UserDao = M("user");
    //(1)根据用户的open_id去 https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
    $access_token = "RQ4fmRD-a2JflW7_9-mmefNkHnK35aoZHHXn9PoB_vqDfxVWdT8XNbtfv5F1v1yK_b81Xar3So4gRLdlX6QxJfa5fGApcOAeLI_Fx3h9hxGjkNhUgADXidNBKIi5EjanHOZjADAVCN";
    $url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=".$access_token."&openid=".$open_id."&lang=zh_CN";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //要求保存的结果到字符串还是输出在屏幕上，非0表示保存到字符串中
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); //对认证来源的检查，0表示阻止对证书的合法性检查
    $result = curl_exec($ch);
    DLOG("result".$result,"run","caodi");
    curl_close($ch);
    $user_info = json_decode($result,true);
    //(2)将得到的用户信息保存到数据库中去
    $data = array();
    $data['user_nick'] = $user_info['nickname'];
    $user_info['sex'] = $user_info['sex'] == 0 ? 1 : $user_info['sex']; //将性别为0的转化为默认的男性
    $data['user_sex'] = $user_info['sex'];
    $data['user_avatar'] = $user_info['headimgurl'];
    $data['user_type'] = 1;//用户类型 1-普通用户 2-助理
    $open_id = json_decode($open_id,true);
    $data['wx_open_id'] = $user_info['openid'];
    $data['user_app_version'] = "wechat9.0";
    $data['user_platform'] = "wechat";  //当前使用的设备平台
    $data['user_create_time'] = date("Y-m-d H:i:s",time());
    $result = $UserDao->add($data);
    DLOG("sql= ".$UserDao->getlastsql(),"run","caodi");
    if($result === false) {
        DLOG("数据库插入失败","run","caodi");
        exit;
    }
}

/*自定义菜单的生成
 *author:caodi
 *date:2015-09-24
 */
public function create_menu(){
    include_once(APP_PATH."Common/Conf/menu_config.php");
    $data = $menu_config;
    $access_token = "RQ4fmRD-a2JflW7_9-mmefNkHnK35aoZHHXn9PoB_vqDfxVWdT8XNbtfv5F1v1yK_b81Xar3So4gRLdlX6QxJfa5fGApcOAeLI_Fx3h9hxGjkNhUgADXidNBKIi5EjanHOZjADAVCN";
    $url = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=".$access_token;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS,$data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $result = curl_exec($ch);
    curl_close($ch);
    var_dump($result);
    exit;
}

/*通过OAuth2.0的网页授权(自定义菜单中，获取用户的openID同时进入我的任务页)
 *author:caodi
 *date:2015-09-24
 */
public function my_task () {
    $code = $_GET['code'];
    $oprn_id = $this->code_to_openID($code);
    var_dump($code);
    echo "caodi"."<br>";
    echo "<center><h1>{$open_id}</h1></center>";
}

/*由OAuth2.0获取到的code转化成用户的openID
 *author:caodi
 *date:2015-09-24
 */
public function code_to_openID($code) {
    if (empty($code) == true) {
        DLOG("获取的code为空","run","caodi");
        exit;
    }        
    $appid = $this->app_id;
    $secret = $this->secret;
    $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$secret."&code=".$code."&grant_type=authorization_code";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $result = curl_exec($ch);
    DLOG("由OAuth2.0获取到的code转化成用户的openID的结果=".$result,"run","caodi");
    curl_close($ch);
    $user_info = json_decode($result,true);
    $open_id = $user_info['openid'];
    return $open_id;
}
}
?>