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  How expensive is a MySQL query?

Database access speed is always the bottle neck of many applications. Many application have large amount of data to search, retrieve and display nowadays. How do we improve the performance of our applications, how do we reduce the cost of database access? Apart from the design of database, the quality of the query is also one important factor to take care.  But before that, we need to know how much network traffic a query will consume. Yunyang,Zhang from Nubee in Singapore did some research...

   MySQL,Network traffic,Query     2013-04-09 05:13:33

  File upload in PHP

File is a special kind of form data, when being uploaded to the server through HTTP POST request, PHP will create a $_FILES global array, the relevant file information will be stored in this global array. We will illustrate file upload with some code snippets using PHP and look into the internal work mechanism. Lastly will talk about file upload security. File upload In order for users to upload files in client side, we have to provide a form on the user interface. Since the uploaded file is a s...

   File upload,PHP     2012-11-30 22:01:28

  Some hidden XSS injection vulnerabilities

XSS injection refers to a Web page generates some unexpected executable js codes based on user input  and these executable codes are executed by web browser,i.e, the source code sent to web browser by the server contains some illegal js codes, and these illegal js codes are related to user's input. Common XSS injection vulnerabilities can be fixed with some functions such as htmlspecialchars(escaping HTML special characters) and strip_tags() or similar, but there are some hidden XSS injecti...

   XSS,PHP,Security,Code,JavaScript     2012-08-27 20:32:08

  User experience : Exception handling

Exception handling is the process of handling emergencies or unpredictable operational errors. The specific time of the occurrence of unexpected events and the actual consequences of the specific situation are difficult to predict. How to handle this unexpected crisis is also related to the user experience of your users. Let's first look at how some famous products deal with unexpected exception encountered by users:1. Goodyear tires can automatically expand when leaking.Tire blast is one of the...

   User experience,Exception handling     2013-04-06 05:05:04

  Save QWidget as image

Qt library is an excellent GUI library for C++ programmers developed by Nokia and now is an open source project. Often, we may use QPainter to draw strings, lines or images on a QWidget. We can override the QWidget's paintEvent() method when we want to use QPianter object to draw something on a QWidget. If we want to save the items drawn on QWidget as image for later reference, what can we do? We can save a QWidget as an image. Here is the code for achieving this: QPixmap pixmap(this->size())...

   Qt,C++,QWidget,Image     2012-08-19 12:01:18

  5 Innovative Web Design Trends Startups Should Consider Adopting

Nowadays, every market has the tendency to shift and change on a whim, and it is no different in the world of web design. No one in their right minds has the time to sit and watch the market for possible shifts as it takes up too much time and no one can really predict what’s going to happen so we’re just forced to adapt and improvise. Currently, there are 5 trends that have caused an uproar and have reshaped the online marketplace and are worth looking into. Think Big First an...

       2017-11-02 06:12:47

  What can .htaccess file do?

A .htaccess file is a directory-level configuration file supported by several web servers, that allows for decentralized management of web server configuration. What can a .htaccess file do? We summarized some of them here.  Hope it may help you. 1. Timezone settingSometimes when you use date() or mktime() functions in PHP, , it may display some weird information because of the timezone difference. For example, one possible warning is :Warning: date(): It is not safe to rely on the syste...

   .htaccess,setting,tip     2012-06-15 06:39:39

  New features in PHP 5.5

Just a few days ago, the PHP official website was redesigned. It seems we directly go from Web 1.0 era to Web 2.0 era. In addition to this new change, PHP 5.5 was also released. Some new features are added in this release. Here we summarize some of them. Enable OPCache by default When installing PHP 5.5, the Zend OPCache will be compiled as OPCache by default and OPCache is enabled by default. Some changes to the language itself Add Generator function getLinesFromFile($fileName) { if (!$file...

   PHP 5.5,New features,Generator     2013-07-05 03:13:22

  6 Astounding Joomla Templates That Support EasyBlog

No doubt, blogging offers a fabulous platform where one can express his emotions, and share his views with others over the Internet. It can also help you leverage your business, as you can publish suitable blogs to efficiently promote your products and services. Moreover, one can also use blogs to exhibit his online portfolio and thus, benefit his business.  Today, there are several blogging platforms that offer a brilliant blogging experience. However, Joomla makes a superior choice among ...

   joomla, joomla templates, mobile template     2015-07-03 01:25:19

  Steve Jobs's prediction about wireless,iPad and App Store in 1983

1983 was still a year uncultivated. That year, Apple released the first personal computer Apple Lisa with graphical user interface in the world, TCP/IP was released less than two years, the Internet was basically still a wasteland. General people had few knowledge about computer. Steve Jobs still needed to start with "What is the computer" in his speech. Today, we have become accustomed to social networking, smart phones and mobile Internet, it was really unbelievable at that time. That ye...

   Steve Jobs, record,Apple,prediction     2012-10-03 04:37:17

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