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程序员保值的4个秘密 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...工作和生活带来方便。
开发一个应用，经常会用到高级语言和框架，比如 C# 和 .NET ，比如 C++ 和 Qt ，比如 J2EE ，比如 Ruby on Rails ，比如 Python 和 Django ，比如 Java 和 Android ，比如 Objective-C 和 Cocoa Touch ，比如 JavaScript, PHP……太...
社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...类异常，简单就是有验证码了人为去输入，高级一些可以破解验证码识别算法实现自动输入验证码的目的。
扩展一下 ：所见即所得我们是不是真的做到？规则配置也是个重复的大任务？重复网页如何不抓取？
1、有些网...
subtle differences between JavaScript and Lua [closed]
...ors, including the ternary conditional operator (?: vs and/or), and, as of 5.3, bitwise operators (&, |, etc. vs. metamethods ).
UPDATE: JS now has the exponentiation operator **.
JS has increment/decrement, type operators (typeof and instanceof), additional assignment operators and additiona...
New self vs. new static
I am converting a PHP 5.3 library to work on PHP 5.2. The main thing standing in my way is the use of late static binding like return new static($options); , if I convert this to return new self($options) will I get the same results?
...
Sort array of objects by object fields
...ond argument. Here are some examples:
Using anonymous functions (from PHP 5.3)
usort($your_data, function($a, $b) {return strcmp($a->name, $b->name);});
From inside a class
usort($your_data, array($this, "cmp")); // "cmp" should be a method in the class
Using arrow functions (from PHP...
Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
这几天系统地学习了一下Lua这个脚本语言，Lua脚本是一个很轻量级的脚本，也是号称性能最高的脚本，用在很多需要性能的地方，比如：游戏脚本，nginx，wireshark的脚本，当你把他的源码下下来编译后，你会发现解释器居然不到2...
PHP array_filter with arguments
...
if you a using php 5.3 and above, you can use closure to simplify your code:
$NUM = 5;
$items = array(1, 4, 5, 8, 0, 6);
$filteredItems = array_filter($items, function($elem) use($NUM){
return $elem < $NUM;
});
...
How do I Sort a Multidimensional Array in PHP [duplicate]
...
Introducing: a very generalized solution for PHP 5.3+
I 'd like to add my own solution here, since it offers features that other answers do not.
Specifically, advantages of this solution include:
It's reusable: you specify the sort column as a variable instead of hardco...
Creating the Singleton design pattern in PHP5
...
PHP 5.3 allows the creation of an inheritable Singleton class via late static binding:
class Singleton
{
protected static $instance = null;
protected function __construct()
{
//Thou shalt not construct that ...
How do I get the find command to print out the file size with the file name?
...aris 10:
% find . -name '*.ear' -exec ls -lh {} \; | awk '{print $5, $9}'
5.3M ./dir1/dir2/earFile2.ear
5.3M ./dir1/dir2/earFile3.ear
5.3M ./dir1/dir2/earFile1.ear
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