服務器端接口文件配置

微信公衆號的消息模式是這樣的

訂閱者將消息發送給微信Sever，微信Sever將這個消息轉發給你配置的開發者Sever的接口文件上。

接口文件interface.php

//define your token
define("TOKEN", "your_token");

valid();

function valid()
{
    $echoStr = $_GET["echostr"];
    
    //valid signature
    if (checkSignature()) {
        echo $echoStr;//return 'echoStr'
        exit;
    }
}

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;
    }
}