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Useful functions to provide secure PHP application
Security is a very important aspect of programming. There are many functions or modules in any kind of real programming language providing security functionalities In modern websites, we may often get inputs form users all around the world.There is a famous saying which says that never trust user input. So in web programming languages, we will often see functions which will guarantee the security of the data input from users. Today we will cover some of these functions in the most famous o...
PHP,security,SQL Injection,XSS,AJAX 2014-10-30 04:21:59
Why 0.1+0.2 != 0.3
In programming languages such as JavaScript, c/c++, Java and Matlab, you will find that you will get unexpected result when doing float point calculation. For example, when calculating 0.1 + 0.1, you will not get 0.3: > 0.1 + 0.2 == 0.3 false > 0.1 + 0.2 0.30000000000000004 Don't be surprised of this result, this is the end result of IEEE 754 standard, float point number cannot be accurately represented according to IEEE 754 because: No enough memory is allocated for representing the num...
float point,comparison,JavaScript 2014-11-19 05:32:46
A couple of tips for beginning programmers
Whether it is football, quantum physics, a new foreign language or programming, the beginnings are problematic. What is more, no amount of advice can teach you as much as your own experience. Nevertheless, the following tips will help you avoid some mistakes, save your time and develop good programmer habits from the very beginning.Practise logical thinkingAlthough some may laugh at the stereotype of a programmer being a Maths genius, there is no use denying that learning Maths and Logics prepar...
Programming,Tips,Beginner 2014-06-17 07:47:31
A Perl Regular Expression That Matches Prime Numbers
perl -lne '(1x$_) =~ /^1?$|^(11+?)\1+$/ || print "$_ is prime"' Can you figure out how it works? I give an explanation below, but try to figure it out yourself. Here is what happens when you run it: $ perl -lne '(1x$_) =~ /^1?$|^(11+?)\1+$/ || print "$_ is prime"' 1 2 2 is prime 3 3 is prime 4 5 5 is prime 6 7 7 is prime 8 9 10 11 11 is prime Here is how it works. First, the number is converted in its unary representation by (1x$_). For example, the number 5 gets converted into 1x5, which is ...
Perl,Regex,Regular expression,Prime number,One line 2011-12-26 08:42:00
Global web browser market share statistic in June
The war among the leading web browsers is still on after Google Chrome took over IE as the No.1 web browser last month. Let's take a look at the market share for different web browsers in June 2012.According to statCounter. Chrome still remains at the No. 1 position and its market share is continuously increasing. Its market share increases by 0.28% from 32.43% in May to 32.71% in June. While for IE, eve. though it lost its No. 1 position to Chrome last month, its market share still...
Web browser, Market share,June,2012 2012-07-02 06:08:17
A Programming Idiom You've Never Heard Of
Here are some sequences of events: Take the rake out of the shed, use it to pile up the leaves in the backyard, then put the rake back in the shed. Fly to Seattle, see the sights, then fly home. Put the key in the door, open it, then take the key out of the door. Wake-up your phone, check the time, then put it back to sleep. See the pattern? You do something, then do something else, then you undo the first thing. Or more accurately, the last step is the inverse of the first. Once you're aware ...
Programming,Idiom,Strange 2012-01-04 08:12:25
Hidden messages in logos
A logo is the simplest thing a user can remember about a product or a company. A good logo design will leave deep impression to customers. Each logo tries to convey either their product information or company vision to customers, this information may be easily understood with a glance or it contains some hidden messages which need us to figure out. Today we share some logos which contain some hidden messages. 1. Fedex The arrow between E and X means Fedex will deliver the product to the right p...
The History of Programming Languages
This post is part of our ReadWriteHack channel, which is a resource and guide for developers. The channel is sponsored by the Intel AppUp Developer Program. As you're exploring these resources, check out this helpful resource from our sponsors: AIR for AppUp: What You Need To Know Rackspace recently published a nice infographic on the evolution of programming languages. It starts with FORTRAN and COBOL and runs through Ruby on Rails (which, yes, is a framework and not a language). Unfo...
History,Programming language,C,Java,Java 2011-07-28 09:00:23
Importance of Side Projects
Side projects are important for a few reasons. Programming is a creative process. Side projects allow programming without deadlines or restraints. Side projects allow programming in an exploratory way. Explore new technologies Every day there are more and more bleeding edge technologies coming out. A side project is a great place to try them out. There’s no reason to worry about bugs or performance issues because it’s just a side project. You’re not depending on the ...
Side project,Creative idea,Dealine,Scratch,Launch 2011-11-28 03:17:22
In praise of impractical programming
Although it’s become a cultural mainstay now, I still remember when I first saw that thick book — the one with the wizard on the cover — about a school for magic where wonders are easily conjured by those who know the proper spells. Of course, I’m talking about the Structure and Interpretation of Computer Programs. There was that other book with the spells, but the “Wizard Book†sincerely claimed to teach magic. For the past few years, I’ve been ...
Impractical Programming,Structure,Scheme,Practical 2011-12-05 12:28:58
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