读取带有括号的标题时，PHP 的 imap_fetch_overview() 函数是否存在错误？

我使用以下代码在 PHP 中发送电子邮件：

<?php
error_reporting(E_ALL);

# write mail
###############################################################################
$recipient  = "[email protected]";
$subject    = mb_encode_mimeheader("Subject äöü ");
$text       = "Hallo";
$header     = "From:".mb_encode_mimeheader("Name with [], ÄÖÜ and spaces")." <[email protected]>"
                . "\r\n" . "Reply-To: [email protected]"
                . "\r\n" . "X-Mailer: PHP/" . phpversion();

// send e-mail
mail($recipient, $subject, $text, $header);
?>

之后我尝试使用以下命令阅读电子邮件imap_fetch_overview()在下面的代码中：

<?php
# receive mails
###############################################################################
$mailbox        = imap_open("{imap.server.tld/norsh}", "[email protected]", "********");

$MC = imap_check($mailbox);
$result = imap_fetch_overview($mailbox,"1:{$MC->Nmsgs}",0);

echo "<table>";
foreach ($result as $overview) {
    echo "<tr>"
        ."<td>".$overview->msgno."</td>"
        ."<td>".$overview->uid."</td>"
        ."<td>".$overview->date."</td>"
        ."<td>".$overview->udate."</td>"
        ."<td>".$overview->from."</td>"
        ."<td>".$overview->to."</td>"
        ."<td>".$overview->size."</td>"
        ."<td>".$overview->subject."</td>"
        ."</tr>";
}
echo "</table>";
?>

我收到以下错误：

Notice: Undefined property: stdClass::$from in /mail_test.php on line 34

And $overview->from没有价值。

当“From:”部分不包含括号时，没有问题。我还必须对括号进行编码吗？如何？我想mb_encode_mimeheader()正在做这项工作。

EDIT:

的结果var_dump($overview) is:

object(stdClass)#18 (14) {
  ["subject"]=>
  string(40) "Subject =?UTF-8?B?w4PCpMODwrzDg8K2IA==?="
  ["to"]=>
  string(16) "[email protected]"
  ["date"]=>
  string(31) "Thu, 16 Aug 2012 16:58:23 +0200"
  ["message_id"]=>
  string(58) "<**************************************>"
  ["size"]=>
  int(1585)
  ["uid"]=>
  int(18)
  ["msgno"]=>
  int(17)
  ["recent"]=>
  int(1)
  ["flagged"]=>
  int(0)
  ["answered"]=>
  int(0)
  ["deleted"]=>
  int(0)
  ["seen"]=>
  int(0)
  ["draft"]=>
  int(0)
  ["udate"]=>
  int(1345129104)
}

问题是，

echo mb_encode_mimeheader("Name with [], ÄÖÜ and spaces");

returns

Name with [], =?UTF-8?B?w4PChMODwpbDg8KcIGFuZCBzcGFjZXM=?=

这不是你想要的。

I found php.net 上有这个函数，这可能会帮助您：

function EncodeMime($Text, $Delimiter) { 
    $Text = utf8_decode($Text); 
    $Len  = strlen($Text); 
    $Out  = ""; 
    for ($i=0; $i<$Len; $i++) 
    { 
        $Chr = substr($Text, $i, 1); 
        $Asc = ord($Chr); 

        if ($Asc > 0x255) // Unicode not allowed 
        { 
            $Out .= "?"; 
        } 
        else if ($Chr == " " || $Chr == $Delimiter || $Asc > 127) 
        { 
            $Out .= $Delimiter . strtoupper(bin2hex($Chr)); 
        } 
        else $Out .= $Chr; 
    } 
    return $Out; 
} 
echo EncodeMime("Name with [], ÄÖÜ and spaces", '%');

它返回

Name%20with%20[],%20%C4%D6%DC%20and%20spaces