接入微信公眾賬號API--驗證的代碼實現

<?php

//1、將timestamp, nonce, token 按字典序排序
$timestamp = $_GET['timestamp'];
$nonce = $_GET['nonce'];
$token = 'weixin';   //你在公眾平臺上填寫的token
$signature = $_GET['signature'];
$arr = array( $timestamp, $nonce, $token );
sort($arr);

//2、將排序後的3個參數拼接後用sha1加密
$tmpstr = implode('', $arr);
$tmpstr = sha1($tmpstr);

//3、將加密後的字元串與signature進行對比，判斷該請求是否來自微信
if($tmpstr == $signature){
    echo $_GET['echostr'];
    exit;
}