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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！
...泄露告警或控制石油管道阀门的命令，就必须要在网络有问题的情况下也要能确保发送成功。
myriota这家提供物联网数据LEO卫星传输服务的公司，流量报价是1M字节的数据500美元/月。因此，每次传输节省几个字节也能省不少...
Where do I put image files, css, js, etc. in Codeigniter?
....php:
function asset_url(){
return base_url().'assets/';
}
I will usually keep common routines similar to this in the same file and autoload it with codeigniter's autoload configuration.
Note: autoload URL helper for base_url() access.
application/config/autoload.php:
$autoload['helper...
Type-juggling and (strict) greater/lesser-than comparisons in PHP
...RUE); // bool(false)
Extra: PHP's < operator is not trichotomous, i.e. all of $a < $b, $b < $a and $a == $b can be false (Example same as for <= not being total).
Extra: PHP's < operator can be circular, i.e. it is possible that $a < $b, $b < $c and $c < $a:
var_dump(INF &...
boost自定义composite_key_compare比较函数 - C/C++ - 清泛网 - 专注C/C++及内核技术
...以自定义比较函数。另外，如果调试过程中遇到很奇怪的问题，可以在自定义比较函数中下断点进行调试。
// boost_demo.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include "boost/shared_ptr.hpp"
#include "boost/bimap.hpp"
#in...
Returning JSON from PHP to JavaScript?
I have a PHP script that's being called through jQuery AJAX. I want the PHP script to return the data in JSON format to the javascript. Here's the pseudo code in the PHP script:
...
PHP function to build query string from array
...ing for the built in PHP function to do this, not a homebrew one (that's all a google search seems to return). There is one, I just can't remember its name or find it on php.net. IIRC its name isn't that intuitive.
...
Boost程序库完全开发指南——深入C++“准”标准库高清PDF版 - 文档下载 - ...
...接受起来容易不少，让人感觉 Boost 真的有用，解决实际问题，这样读者对 Boost 的兴趣就被勾了起来，再往下读，也不那边怕艰难了。其实按我的设想，我觉得接下来就讲一下字符串和各种容器，比如 tuple、unordered、bimap、circular...
How to configure XAMPP to send mail from localhost?
...mail\sendmail.exe\" -t"
Now Open C:\xampp\sendmail\sendmail.ini. Replace all the existing code in sendmail.ini with following code
[sendmail]
smtp_server=smtp.gmail.com
smtp_port=587
error_logfile=error.log
debug_logfile=debug.log
auth_username=my-gmail-id@gmail.com
auth_password=my-gmail-passwo...
How to concatenate strings in twig
...like Alessandro said, and here it is in the documentation:
~: Converts all operands into strings and concatenates them. {{ "Hello
" ~ name ~ "!" }} would return (assuming name is 'John') Hello John!. – http://twig.sensiolabs.org/doc/templates.html#other-operators
And here is an example so...
How to make a website secured with https
I have to build a small webapp for a company to maintain their business data... Only those within the company will be using it, but we are planning to host it in public domain, so that the employees can connect to app from various locations. (Till now I have built web apps that are hosted internall...