<?php

//獲得參數(shù) signature nonce token timestamp echostr

$nonce ? ? = $_GET['nonce'];

$token ? ? = 'imooc';

$timestamp = $_GET['timestamp'];

$echostr ? = $_GET['echostr'];

$signature = $_GET['signature'];

//形成數(shù)組，然后按字典序排序

$array = array();

$array = array($nonce, $timestamp, $token);

sort($array);

//拼接成字符串,sha1加密 ，然后與signature進(jìn)行校驗(yàn)

$str = sha1( implode( $array ) );

if( $str ?== $signature && $echostr ){

//第一次接入weixin api接口的時(shí)候

echo ?$echostr;

exit;

}