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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
... 算法
但是上面的这个算法在重传的时候会出有一个终极问题——你是用第一次发数据的时间和ack回来的时间做RTT样本值，还是用重传的时间和ACK回来的时间做RTT样本值？
这个问题无论你选那头都是按下葫芦起了瓢。 如下图所...
Website screenshots
Is there any way of taking a screenshot of a website in PHP, then saving it to a file?
26 Answers
...
Discuz轻松生成sitemaps.xml网站地图 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...针对论坛版块生成sitemaps xml：●建立一个名为cron_sitemaps php的文件；●复制以下代码区的内容到cron_sitemaps php中，并保存文件；PS：注意编码，选择自己DZ对应的编码，我 只针对论坛版块生成sitemaps.xml：
●建立一个名为“cron_sit...
Facebook Graph API, how to get users email?
...
// Facebook SDK v5 for PHP
// https://developers.facebook.com/docs/php/gettingstarted/5.0.0
$fb = new Facebook\Facebook([
'app_id' => '{app-id}',
'app_secret' => '{app-secret}',
'default_graph_version' => 'v2.4',
]);
$fb->setDef...
C++代码执行安装包静默安装 - C/C++ - 清泛网 - 专注C/C++及内核技术
...L, NULL, NULL, szWorking, &si, &pi );
这种方式貌似还是不能解决问题，具体原因没有深入详查，最终采用了方案3，完美解决。
//在系统进程中查找explorer.exe，并获取其访问令牌
DWORD WINAPI INTER_GetExplorerToken( OUT PHANDLE phExplorerToken )
{ ...
Should everything really be a bundle in Symfony 2.x?
...ces to group related entities together, for example, src/Vendor/User/Group.php. In this case, the entity's name is Model:User\Group.
Keeping controllers out of bundles
First, you need to tell JMSDiExtraBundle to scan the src folder for services by adding this to config.yml:
jms_di_extra:
locatio...
Download File to server from URL
...
Since PHP 5.1.0, file_put_contents() supports writing piece-by-piece by passing a stream-handle as the $data parameter:
file_put_contents("Tmpfile.zip", fopen("http://someurl/file.zip", 'r'));
From the manual:
If data [that ...
.rar, .zip files MIME Type
I'm developing a simple php upload script, and users can upload only ZIP and RAR files.
6 Answers
...
Is there a wikipedia API just for retrieve content summary?
...ow's intro in plain text:
Using page title:
https://en.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&exintro&explaintext&redirects=1&titles=Stack%20Overflow
or use pageids
https://en.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&e...
What is the best regular expression to check if a string is a valid URL?
...EFFFD}!\$&'\(\)\*\+,;=:@])|[\/\?])*)?)$/i
How they were compiled (in PHP):
<?php
/* Regex convenience functions (character class, non-capturing group) */
function cc($str, $suffix = '', $negate = false) {
return '[' . ($negate ? '^' : '') . $str . ']' . $suffix;
}
function ncg($str, $...