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How to encrypt/decrypt data in php?
...random number generator. The following example would be recommended (>= 5.3):
$key_size = 32; // 256 bits
$encryption_key = openssl_random_pseudo_bytes($key_size, $strong);
// $strong will be true if the key is crypto safe
This can be done once or multiple times (if you wish to create a chain ...
Difference between array_map, array_walk and array_filter
...itrary parameter to pass to the callback. This mostly irrelevant since PHP 5.3 (when anonymous functions were introduced).
Length of Returned Array:
The resulting array of array_map has the same length as that of the largest input array; array_walk does not return an array but at the same time it...
What is Autoloading; How do you use spl_autoload, __autoload and spl_autoload_register?
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Since PHP 5.3, you can use spl_autoload_register() with namespaces, which means that you can organize your project and autoload your php classes without any require or include and without redefining an __autoload() function.
To demon...
What's the difference between :: (double colon) and -> (arrow) in PHP?
... resolution, and it may have either a class name, parent, self, or (in PHP 5.3) static to its left. parent refers to the scope of the superclass of the class where it's used; self refers to the scope of the class where it's used; static refers to the "called scope" (see late static bindings).
The r...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...并发实用程序，这个包应该用于 Java 开发工具箱 1.5 发行版。
结束语
线程池是组织服务器应用程序的有用工具。它在概念上十分简单，但在实现和使用一个池时，却需要注意几个问题，例如死锁、资源不足和wait() 及 notify(...
How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throw
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I had same issue with primefaces 5.3 and I went through all the points described by BalusC with no result. I followed his advice of debugging FileUploadRenderer#decode() and I discovered that my web.xml was unproperly set
<context-param>
<param-n...
When to use static vs instantiated classes
...'d use (and I've used them to mimic the JavaScript prototype object in PHP 5.3) static members is when I know that the respective field will have the same value cross-instance. At that point you can use a static property and maybe a pair of static getter/setter methods. Anyway, don't forget to add p...
Performance of FOR vs FOREACH in PHP
...for just the reference is actually less than copying the array (this is on 5.3.2)... So it appears (on 5.3.2 at least) as if references are significantly faster...
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淘宝网采用什么技术架构来实现网站高负载的 - 更多技术 - 清泛网 - 专注C/C...
...的过程中，我们所说的拆分就出现V2.2和V3.0之 间。在V2.2版 本中，淘宝几乎所有的逻辑都放在(Denali)系统中，这样导致的问题就是系统扩展和修改非常麻烦，并且更加致命的是随着淘宝业务量的增加，如果按照V2.2的架构已经没有...
Correct way to delete cookies server-side
...er or any spec-compliant user agent. tools.ietf.org/search/rfc6265#section-5.3 dictates that "The user agent MUST evict all expired cookies from the cookie store if, at any time, an expired cookie exists in the cookie store." and to the best of my knowledge that is what every browser in fact does.
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