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一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术
...事的方式，逐步告诉大家比特币提出的动机、解决了什么问题以及一些关键组件的目标和设计方案。
问题的提出
我们先从比特币产生的动机开始。
以物易物的比特村
话说在这个世界上，有一个叫比特村的小村庄，村庄共有...
创建增量同步Oracle物化视图问题 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
创建增量同步Oracle物化视图问题我们采用Oracle的物化视图增量刷新机制定时将数据库A上的某个表的数据同步到另一个数据库B上。我们常用的最简单的实现步骤是这样。首先在数...我们采用Oracle的物化视图增量刷新机制定时将数...
线程访问窗口资源的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
线程访问窗口资源的问题在开个线程时常为所开的线程传入个窗口参数（cwnd），这里里面有个很大的隐患就是当做CWnd::AssertValid()检查，就会遇到断言失败。具...时常为所开的线程传入个窗口参数 （cwnd），这里里面有个很大的...
How to get first 5 characters from string [duplicate]
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For single-byte strings (e.g. US-ASCII, ISO 8859 family, etc.) use substr and for multi-byte strings (e.g. UTF-8, UTF-16, etc.) use mb_substr:
// singlebyte strings
$result = substr($myStr, 0, 5);
// multibyte strings
$result = mb_substr($myStr, 0, 5);
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How to create an array from a CSV file using PHP and the fgetcsv function
...n someone kindly provide a code to create an array from a CSV file using fgetcsv?
14 Answers
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Performance of FOR vs FOREACH in PHP
...is not the only criteria to choose what to adopt. especially in such a farfetched case. Frankly, you're just wasting your time
– Your Common Sense
Aug 7 '10 at 14:31
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PHP Session Fixation / Hijacking
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Storing sensitive info in the session
Changing anything about the session
etc...
Session Hijacking
This is where an attacker gets a hold of a session identifier and is able to send requests as if they were that user. That means that since the attacker has the identifier, they are all but indis...
Best way to check if a URL is valid
...ER_VALIDATE_URL will not validate the protocol of a url. So ssh://, ftp:// etc will pass.
– Seph
May 10 '14 at 14:03
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java中的缓存技术该如何实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...存在于什么地方?3缓存有哪些属性?4缓存介质?搞清楚这4个问题,那么我们就可以随意的通过应用的场景来判断使用何...1、缓存为什么要存在？
2、缓存可以存在于什么地方？
3、缓存有哪些属性？
4、缓存介质？
搞清楚这4个...
How do I upgrade PHP in Mac OS X?
...s own custom .conf file before it loads the Apache httpd.conf (located at /etc/apache2/httpd.conf). The server file is located:
/Library/Server/Web/Config/apache2/httpd_server_app.conf
When you open this file, you have to comment out this line like so:
#LoadModule php5_module libexec/apache2/lib...