要把微信返回的再返回给微信就可以验证通过了

$signature = $_GET["signature"];

$timestamp = $_GET["timestamp"];

$nonce = $_GET["nonce"];

$token = 'efae1312e21e1xc';

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

sort($tmpArr, SORT_STRING);

$tmpStr = implode( $tmpArr );

$tmpStr = sha1( $tmpStr );

$this->log($tmpStr);

$this->log($signature);

if( $tmpStr == $signature ){

    echo $_GET['echostr'];

    exit;

}else{

    return false;

}