verify-wechat.php

<?php
$signature = $_GET['signature'];
$timestamp = $_GET['timestamp'];
$nonce = $_GET['nonce'];
$echostr = $_GET['echostr'];


$selfToken = 'If985hike';

// 自行计算的signature
$enc = k_verify($selfToken, $timestamp, $nonce);


function k_verify($selfToken, $timestamp, $nonce) {
  $array = array($selfToken, $timestamp, $nonce);
  sort($array, SORT_STRING);
  $str = implode($array);
  return sha1($str);
}



if($enc == $signature){
  echo $echostr;
}else{
  echo '';
}