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  How does PHP session work?

This article is about how PHP session works internally. Below are the steps : 1. Session in PHP is loaded into PHP core as an extension, we can understand it as an extension. When session extension is loaded, PHP will call core functions to get the session save_handler, i.e interface or functions for reading and writing session data. By default, PHP will handle session data by writing and reading files on the server. But PHP also supplies custom methods for handling session data, we can use sess...

   PHP, session, mechanism     2012-12-28 13:36:49

  iPhone 7 may come with following new features

There are all kinds of news that iPhone 7 will be released in the coming September. Now the news seems to be convincing. On 26 August, a Sina Weibo(China's Twitter) user @POPPUR posted an weibo which says that China Telecom, one of the largest telecom vendors in China, has opened the pre-order of iPhone 7. Along with this, a few new features of iPhone 7 are also released. On the photo uploaded, there are a few new features of iPhone 7 displayed. They are : Waterproof No headphone jack Wireless...

   NEW FEATURE,NEWS,IPHONE 7,CHINA TELECOM     2016-08-27 03:50:41

  Facebook fires a few Chinese employees

There is a big news happening in the Silicon Valley in past few days. Facebook fired a few Chinese employees for bringing outsiders into Facebook's campus and canteen on a charged basis. It's well known that tech companies in Silicon Valley provide attractive welfare to their employees. We often heard about the news that lots of free service(including free food, free laundry, free massage etc) are provided to employees to encourage them to stay effective when working. This is good news and welc...

   Facebook,Chinese employee, Chummy     2015-09-03 07:39:05

  7 misunderstandings of DNS resolution

DNS resolution is generally considered as providing mapping between domain name and IP address, for example www.google.com maps to 74.125.71.103. There are two important reasons for doing DNS resolution: IP address is hard to remember, while domain name is human friendly Virtual host may access different contents according to the header of the host domain name(sub-domain name) Some webmasters may have some unreasonable requirements when doing DNS resolution. It mainly because they are not very...

   DNS resolution,misunderstanding     2012-10-20 12:57:16

  Let’s Find Out What the Future holds for .Net Technology

Technology is more like an evolution, not a revolution. The disruptive industry seems to be changing day in day out. Due to which tech companies by default have to chase new trends in order to stay ahead of the curve. Now, Microsoft.Net framework has been around since the 1990s! Do you think such refined technology can be considered relevant now? From what I can see, .Net is going through a major transformation. It’s gone largely open source and has been getting modernized so that its wor...

   ASP.NET ,.NET     2018-06-12 05:07:53

  Use Delve to debug GoLang program

If you don't know how to debug program, you are not a real programmer. gdb can be used to debug go program, but according to golang website, delve is a better option.   Note that Delve is a better alternative to GDB when debugging Go programs built with the standard toolchain. It understands the Go runtime, data structures, and expressions better than GDB. Below is a simple go program. package main type Person struct { Name string Age int } func main() { var me Person me.Nam...

   GOLANG,DEBUG,DELVE     2018-11-09 23:28:43

  Create cron job on CentOS

These two days, I am building a website and deploying it on a VPS server which uses CentOS 5. I don't have cPanel or Plesk for my account, so I need to install and configure everything myself including Apache, PHP, MySQL and FTP server, also today's topic cron job. Since my website has a ranking algorithm to calculate the rankings of each link and update the ranking on database and I need to calculate the rankings every 5 minutes, so I think to use cron jobs. Here are what I have done which may ...

   cron job,crontab,CentOS,linux,php,example     2012-06-11 09:23:45

  Performance is a Feature

We've always put a heavy emphasis on performance at Stack Overflow and Stack Exchange. Not just because we're performance wonks (guilty!), but because we think speed is a competitive advantage. There's plenty of experimental data proving that the slower your website loads and displays, the less people will use it. [Google found that] the page with 10 results took 0.4 seconds to generate. The page with 30 results took 0.9 seconds. Half a second delay caused a 20% drop in traffic. Half a seco...

   Website,Perfomance,Optimization     2011-07-02 01:52:12

  5 million units of Galaxy Note II are sold until now

Samsung announced on its official website that the Galaxy Note II sales have exceeded 5 million units, the number of shipments reached 2 million in last 24 days.Galaxy Note II was officially released at the end of August and was on sale at the end of September, equipped with Android 4.1 Jelly Bean system, 5.5 inches HD Super AMOLED screen and a 1.6GHz quad-core Exynos processor.In the first 37 days on sale, Samsung Galaxy Note II had achieved 3 million units of sales,the sales is  three ti...

   Samsung Galaxy Note II,Sale     2012-11-26 11:19:21

  Some measures for improving Linux server security

The hackers often exploit server weakness to gain access control to some servers. With a scanner, aimlessly looking undefended host, backdoor, control, and sold to people in need. Some basic security measures can be taken on Linux servers to avoid being attacked by hackers. Disable root remote login As the default administrative account, root is the account which is most likely to be attacked.Disabling ssh remote login is necessary. Method: Edit / etc / ssh / sshd_config PermitRootLogin no At t...

   Linux server,Server security     2012-08-21 05:08:50

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