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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...问控制、集群、共享订阅、重要指标dashboard、sysadmin api、插件扩展、对topic或session或clientid的tracing调试等高级功能，大大简化服务器端的开发工作量。实际应用中，只需要写发布和订阅接口函数即可，中间过程对应用开发人员透...
How to remove non-alphanumeric characters?
...ld'); // helloworld
preg_replace('/[^\p{L}\p{N} ]+/', '', 'abc@~#123-+=öäå'); // abc123öäå
preg_replace('/[^\p{L}\p{N} ]+/', '', '你好世界!@£$%^&*()'); // 你好世界
Note: This is a very old, but still relevant question. I am answering purely to provide supplementary information...
Remove all special characters from a string [duplicate]
...;
}
function cleanString($text) {
$utf8 = array(
'/[áàâãªä]/u' => 'a',
'/[ÁÀÂÃÄ]/u' => 'A',
'/[ÍÌÎÏ]/u' => 'I',
'/[íìîï]/u' => 'i',
'/[éèêë]/u' => 'e',
'/[ÉÈÊË]/u' => 'E...
Characters allowed in a URL
...;yxcvbnm,.-°!"§$%&/()=? `QWERTZUIOPÜ*ASDFGHJKLÖÄ\'>YXCVBNM;:_²³{[]}\|µ@€~
These were not encoded:
^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,.-!/()=?`*;:_{}[]\|~
Not encoded after urlencode():
0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ....
SliderVertical拓展：将滑块组件旋转 90º - App Inventor 2 拓展 - 清泛IT...
将滑块组件旋转 90º，效果如下：
[hide]来源：https://community.appinventor.mi ... o-ranges-free/29465
http://kio4.com/appinventor/294K_extension_crear_Deslizador.htm
[/hide]
谢谢谢谢谢谢谢谢分享
Case insensitive XPath contains() possible?
...ÇÅÏÕÑŒ', 'abcdefghijklmnopqrstuvwxyzäöüéèêàáâòóôùúûçåïõñœ'),'foo')]");
– Stefan Steiger
Nov 29 '13 at 9:34
1
...
What does the ??!??! operator do in C?
...if (x || y) { a[i] = '\0'; } looking like if (x öö y) ä aÄiÅ = 'Ö0'; å in the wrong charset.
– Ilmari Karonen
Oct 20 '11 at 13:36
9
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Designing function f(f(n)) == -n
...
@a1kmm: Sorry, -2³² above should have been -2³¹. Anyway, the case where f(0)≠0 (and so f(0)=-2³¹) is actually the easier case, as we showed these two are disconnected from the rest. The other case we need to consider is that f(0)=0, b...
Setting the correct encoding when piping stdout in Python
...at you receive, and encode what you send.
# -*- coding: utf-8 -*-
print u"åäö".encode('utf-8')
Another didactic example is a Python program to convert between ISO-8859-1 and UTF-8, making everything uppercase in between.
import sys
for line in sys.stdin:
# Decode what you receive:
lin...
Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
...ost" the socket connector is used, but when you connect to "127.0.0.1" the TCP/IP connector is used. You could try using "127.0.0.1" if the socket connector is not enabled/working.
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