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Extracting bits with a single multiplication
...
Very interesting question, and clever trick.
Let's look at a simple example of getting a single byte manipulated. Using unsigned 8 bit for simplicity. Imagine your number is xxaxxbxx and you want ab000000.
The solution consisted of two steps: a bit masking, followed by multiplication. The bit ...
What is external linkage and internal linkage?
.... Such variables are said to have internal linkage.
Consider following example:
1.cpp
void f(int i);
extern const int max = 10;
int n = 0;
int main()
{
int a;
//...
f(a);
//...
f(a);
//...
}
The signature of function f declares f as a function with external linkage (de...
What browsers support HTML5 WebSocket API?
...
XSockets.NET
SuperWebSocket
Nugget
Alchemy-Websockets
Fleck
SignalR
In PHP:
Ratchet
phpwebsocket.
Extendible Web Socket Server
phpdaemon
In Python:
pywebsockets
websockify
gevent-websocket, gevent-socketio and flask-sockets based on the former
Autobahn
Tornado
In C:
libwebsockets
In ...
MongoDB sort排序、index索引教程 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...据如下：
{ "_id" : ObjectId("56066542ade2f21f36b0313a"), "title" : "PHP 教程", "description" : "PHP 是一种创建动态交互性站点的强有力的服务器端脚本语言。", "by" : "菜鸟教程", "url" : "https://www.tsingfun.com", "tags" : [ "php" ], "likes" : 200 }
{ "_id" : Obje...
In JavaScript, why is “0” equal to false, but when tested by 'if' it is not false by itself?
...
It's PHP where the string "0" is falsy (false-when-used-in-boolean-context). In JavaScript, all non-empty strings are truthy.
The trick is that == against a boolean doesn't evaluate in a boolean context, it converts to number, an...
What is the difference between MySQL, MySQLi and PDO? [closed]
...
There are (more than) three popular ways to use MySQL from PHP. This outlines some features/differences PHP: Choosing an API:
(DEPRECATED) The mysql functions are procedural and use manual escaping.
MySQLi is a replacement for the mysql functions, with object-oriented and procedur...
How can I change a file's encoding with vim?
...
thank you! Apache was outputting utf-8, so was php, so the browser said, so vim said with set encoding, and still the pages showed mangled characters that were alright as iso-8859-1. using set fileencoding showed a pretty 'Latin1'
– Adriano Varoli Pi...
What is a faster alternative to Python's http.server (or SimpleHTTPServer)?
... Use this if you
have a directory full of HTML, cgi, php3, epy, or rpy
files or any other files that you want to be served up
raw.
There are also a bunch of other commands such as:
conch A Conch SSH service.
dns ...
HTML5 Pre-resize images before uploading
...
How do you handle the PHP part of it after you add it to the FormData()? You wouldn't be looking for $_FILES['name']['tmp_name'][$i], for example? I'm trying if(isset($_POST['image']))... but the dataurl not there.
– denikov
...
Convert character to ASCII code in JavaScript
...ototype.charCodeAt() can convert string characters to ASCII numbers. For example:
"ABC".charCodeAt(0) // returns 65
For opposite use String.fromCharCode(10) that convert numbers to equal ASCII character. This function can accept multiple numbers and join all the characters then return the string....