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	public function TokenCode()
	{	
		
		$signature = $this->request->param('signature');
		$timestamp = $this->request->param('timestamp');
		$echostr = $this->request->param('echostr'); 
		$nonce = $this->request->param('nonce');
		$token = 'a5c6r7d8l9'; 
		$tmpArr = array($token, $timestamp, $nonce);
		sort($tmpArr, SORT_STRING);
		$tmpStr = implode( $tmpArr );
		$tmpStr = sha1( $tmpStr );
		if ($tmpStr == $signature ) {
			return $echostr;
		} else {
			return '返回失败';
		}
	}
 备注: 接收参数的方式自行调整 我这里是Tp5框架演示 return 若是不行 就换成 echo $echostr; exit();微信给出的实例代码 是没有 "echostr"这个参数的 所以需要自己加微信回调的参数
 'signature' => 'c5bb79fdca47378ebf851844f5718a6846a95969',
  'echostr' => '190543481234128882',
  'timestamp' => '1628038386',
  'nonce' => '1430849020',
 这个我设置的token为 a5c6r7d8l9postman测试接口 返回是 echostr的字符串 就代表代码莫得问题了
 
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