如何不下载/上传已经存在的IMAP消息？
如何不下载/上传已经存在的IMAP消息？
提问于 2019-05-14 13:19:51
我有一个带有循环的脚本，可以从一个服务器下载消息并将其上传到另一个服务器。如果消息已经存在于目标中，我不希望浪费对imap_fetchbody和imap_append的调用。有没有什么我可以在"message_not_existing_in_target“中使用的东西？
$source_imap = imap_open(...);
$target_imap = imap_open(...);
...
if (message_not_existing_in_target) {
$message = imap_fetchbody($source_imap, $i, '', FT_PEEK);
imap_append($target_imap, $mbox, $message);
}至少我需要：
$message = imap_fetchbody($source_imap, $i, '', FT_PEEK);
if (message_not_existing_in_target)
imap_append($target_imap, $mbox, $message);因为上传往往比下载慢。
我想提一下一些IMAP服务，像Gmail的服务似乎有他们自己的内部重复检查-它们只返回TRUE，而不实际保存重复的消息。但消息需要上传才能被检测为重复，因此效率仍然不高。
回答 1
Stack Overflow用户
发布于 2019-05-14 14:15:57
$sourceImap = imap_open('...');
$targetImap = imap_open('...');
$sourceMessages = $targetMessages = array();
$checkSourceImap = imap_check($sourceImap);
$checkTargetImap = imap_check($targetImap);
if (
$checkSourceImap !== false &&
$checkTargetImap !== false
) {
$sourceImapOverview = imap_fetch_overview($checkSourceImap, "1:{$checkSourceImap->Nmsgs}");
$targetImapOverview = imap_fetch_overview($checkTargetImap, "1:{$checkTargetImap->Nmsgs}");
foreach ($sourceImapOverview as $sourceMessage) {
$sourceMessages[$sourceMessage->msgno] = strtolower(urlencode($sourceMessage->subject) . '_' . urlencode($sourceMessage->from) . '_' . urlencode($sourceMessage->to)) . '_' . $sourceMessage->udate;
}
foreach ($targetImapOverview as $targetMessage) {
$targetMessages[$targetMessage->msgno] = strtolower(urlencode($targetMessage->subject) . '_' . urlencode($targetMessage->from) . '_' . urlencode($targetMessage->to)) . '_' . $targetMessage->udate;
}
$newMessages = array_diff($sourceMessages, $targetMessages);
if (!empty($newMessages)) {
foreach ($newMessages as $messageNumber => $newMessage) {
$message = imap_fetchbody($sourceImap, $messageNumber, '', FT_PEEK);
imap_append($targetImap, $checkTargetImap->Mailbox, $message);
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56123475
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