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  Simple PHP paging class

Frequently in our web applications, we may have many records in the database to display. In order to imrpove loading speed and efficiency, we may need to display some records at a time, so we need to paginate the records. For example, if we have 1 million book records and when users want to view the book list, it's inefficient to display all the records on the same page, we may need to have some pagination to allow displaying a portion of the records such as 20 records per page. This is a simple...

   PHP,Paging,Class     2012-09-10 20:23:33

  A list of different CAPTCHA designs

Here is a list of website CAPTCHA designs which demonstrate all kinds of weird verification methods. By looking at these designs, as a website designer, you should distinguish which design is accessible and which is not.Is this human readable?What characters are in the picture?One moreWe will be crazy if we see theseOMG,What's the answer?IQ Test?Are you a normal person?You know how blind people read?ASCII PictureAre you an adult?3D verification codereCaptchaIt increase a new feature recently. It...

   CAPTCHA,Website design     2012-07-19 11:51:06

  Binary tree iterator algorithm

Binary tree pre-order,in-order and post-order traversal are basics in algorithm and data structure.And the recursive binary tree traversal is a classical application of recursion. We define a binary tree node as : // C++ struct Node { int value; Node *left; Node *right; } In order binary tree traversal can be: // C++ void inorder_traverse(Node *node) { if (NULL != node->left) { inorder_traverse(node->left); } do_something(node); if (NULL != node->righ...

   Binary tree,Iterator,Traversal     2013-07-14 21:51:09

  The danger of target=_blank and opener

When want to open a new page in a new tab on clicking a link on a page, the usual way of achieving this is to use target="_blank" property in a tag. However, the use of this leaves space for phishing website. Background parent and opener Before talking about the opener object, let's know a bit about parent object when using iframe. HTML provides a parent object which is used to communicate between the parent page and the embedded iframe element. This parent object can be accessed using...

   HTML,TARGET BLANK,REL NOOPENER,REL NOREFERRER     2018-09-15 04:53:56

  Facebook steps into the $100 billion club

According to 36 Kr, investors and analysts seemed to be inspired by the Q2 earnings report released on 24th July by Facebook, Facebook share price increased by more than 50% post that. As the U.S. stock market closed, Facebook share price rose $0.79 yesterday, closing at $41.34. As of now, Facebook's market capitalization has reached 100.676 billion U.S. dollars.The reason why Facebook share price kept dropping since its IPO is because investors doubted,the ability of Facebook on selling advert...

   Facebook,Share price     2013-08-27 03:48:12

  JavaScript cross domain request solution

1. What is cross domain? We may often using AJAX to request data from other domain, now we will have cross domain request issues. It's because JavaScript only allows to request data from the same domain because of security consideration. In short, same domain strategy means a piece of code can read data from the same source, the same source here means the combination of the same domain, protocol and port number. For example: URLDescriptionAllow communication? http://www.a.com/a.js http:/...

   AJAX,cross domain,security     2013-03-13 20:04:52

  Mount DD image on Linux

Yesterday, my Raspberry Pi running Arch Linux was not able to boot with error: Kernel Panic, not syncing: no init found. I spent a night on it, but could not find a working solution. The last option is easy: reinstall the system. That is really the last resort, for I do not want to re-setup everything I have done: samba server, Time Machine server, Xunlei Offline Downloader… Unable to mount the SD card The system does not boot, so I need to find a way to get into the file system to identi...

   LINUX,DD IMAGE     2014-06-24 07:49:14

  Google.com is considered as partially dangerous by Google

Google has a service called Transparency Report which is to examine billions of URLs per day to identify dangerous pages which may trigger downloading of malicious software.  When you search a site, it will give the status of the site and also the safety details of the site if there are potential dangerous pages on the site.  These details will help the site owners to identify the potential issues and fix them as early as possible, Embarrassingly when searching for Google.com, it is c...

   GOOGLE,GOOGLE.COM     2016-04-20 00:38:15

  Will PHP __autoload() function really affect performance?

IntroductionRegarding to PHP performance, the most frequently discussed is the __autoload() function. Many people say that this function will affect the performance very much, some other people say that opcode will affect __autoload() as well. So we will have some tests on these two.EnvironmentPHP 5.3.9 -- Launch under fastcgi modeNginx 1.1.12eAccelerator 0.9.6.1ScreenshotsLaunch pageeAccelerator(In php.ini) configurationFile structure(each Test file has over 6000 lines of code)Testing With e...

   PHP,__autoload(),opcode,performance     2012-05-09 11:25:26

  Why cannot Renren be China's Facebook?

Yizhou Chen, CEO of China's SNS community Renren, shouted "one war, three battles". We do not know now how the battle progresses. Currently Renren's net market value is $1.3 billion where 900 million of them are in cash, it means the market values Renren 400 million US dollars only which is far lower than Facebook. Why cannot Renren be China's Facebook? This is a very interesting topic, many users share their opinions, Some of the main points are summarized as follows:Facebook pay more attentio...

   Renren, Facebook,SNS     2012-11-22 11:44:33

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