Wednesday, December 9, 2015
Thursday, November 12, 2015
Monday, November 2, 2015
Dependency Injection in PHP
Introduction
Dependency Injection is an object oriented design pattern that you come across when extending application frameworks logic. It has to do with "more than one class (object) depending on the services of another".
There are lots of articles, tutorials, explanations on the Dependency Injection design pattern. They also mention Inversion of Control. It is based on the popularly known Hollywood catch phrase, "Don't call us, we'll call you".
Those articles often have two things in common: its either their base of explanation on a particular technology (such as Java or C#) or they delve into highly detailed concepts without explaining the main concepts behind the dependency design principle.
This article aims to bridge those gaps by explaining the main concepts behind Dependency Injection (Inversion of Control) design pattern, explain its advantages when compared with other alternatives and list the challenges that you may be faced when using it to write applications.
How Dependency Injection Works?
In normal everyday object oriented application development, a dependency object is passed to a dependent object directly. This may result in lots of issues such as tight coupling, less flexible and reusable code, among others.
Dependency Injection and Inversion of Control Containers are meant to solve these problems by making the dependent object (client) call a dependency when needed. This makes it very easy to develop robust, independent and reusable object oriented class services.
Dependency Injection in Practice
Let me illustrate these concepts with a quick example of a car class object that is dependent on an automobile class.
<?php
class automobile
{
public function __construct()
{
echo "I'm the Automobile Class";
}
public function doSomething()
{
echo "I'm doing something";
return;
}
}
?>
The snippet above defines the automobile class which would act as a parent to the car class. Normally, the car class object would be defined this way:
<?php
class testingDI
{
// a variable for holding a Service Object
private $di_service;
public function __construct() { }
// a Service object to be passed in as parameter
public function setService( Service di_service)
{
// Setting the global di_service object
// equal to the passed in Service object
$this->di_service = di_service;
}
}
?>
Similarly, in interface injection, the client (dependent object) implements an interface which defines how a dependency should be accepted and set. An example is illustrated below:
<?php
interface DIInjector
{
public function diInjector( Service di_service);
}
class testingDI implements DIInjector
{
// a variable for holding a Service Object
private $di_service;
// a Service object to be passed in as parameter
public function setService( Service di_service)
{
// Setting the global di_service object
// equal to the passed in Service object
$this->di_service = di_service;
}
}
?>
Dependency Injection helps to create software that follows the dependency inversion principle. The Dependency Inversion Principle is a common way, especially with object oriented designs, of decoupling various part of a software module into individual entities.
Following this principle means that the Client (the dependent object) does not need to know how to construct it's dependencies, it's the injecting code that constructs the services (the dependencies) and injects them into the client
Dependency Injection and the Single Responsability Principle
This is very similar to the Single Responsibility Principle that states that every object (a class in this case) should have responsibility over a single part of the functionality provided by the software. In order words, the Single Responsibility Principle is all about the simple concept of One Class, One Task.
Conclusion
Dependency Injection is a software design pattern that helps to provide a better structure to an object oriented software design. Although, there are more advanced alternatives to pure Dependency Injection such as using a Dependency Injection (Inversion of Control) Container, instead of directly using the Dependency Injection approach, it still is a major building block for most of this concepts.
In the next article, we look further into the various ways of implementing Dependency Injection. We would talk more about the Controller Injection, Setter Injection and Interface Injection approaches and how they can be useful in various scenarios.
We will also talk about IoC Containers and how to build one for better software reusability, maintainability and testability.
If you liked this article or you have a question about the presented dependency injection concepts, post a comment here.
Monday, October 26, 2015
Tuesday, October 20, 2015
Friday, October 9, 2015
Tuesday, September 29, 2015
Wednesday, September 23, 2015
Sunday, September 13, 2015
Creating a WordPress Theme from Static HTML
create theme
https://www.siteground.com/tutorials/wordpress/wordpress_create_theme.htm
Add menus
http://code.tutsplus.com/tutorials/creating-a-wordpress-theme-from-static-html-adding-navigation--wp-34032
Add Widgets
http://code.tutsplus.com/tutorials/creating-a-wordpress-theme-from-static-html-adding-widgets--wp-34046
Add custom page templates
http://premium.wpmudev.org/blog/creating-custom-page-templates-in-wordpress/
All Tutorials
--------------------
http://tutsplus.com/tutorials/search?utf8=%E2%9C%93&search%5Btopic%5D=&search%5Bterms%5D=Creating+a+WordPress+Theme+from+Static+HTML&button=
https://www.siteground.com/tutorials/wordpress/wordpress_create_theme.htm
Add menus
http://code.tutsplus.com/tutorials/creating-a-wordpress-theme-from-static-html-adding-navigation--wp-34032
Add Widgets
http://code.tutsplus.com/tutorials/creating-a-wordpress-theme-from-static-html-adding-widgets--wp-34046
Add custom page templates
http://premium.wpmudev.org/blog/creating-custom-page-templates-in-wordpress/
All Tutorials
--------------------
http://tutsplus.com/tutorials/search?utf8=%E2%9C%93&search%5Btopic%5D=&search%5Bterms%5D=Creating+a+WordPress+Theme+from+Static+HTML&button=
Thursday, September 10, 2015
Monday, September 7, 2015
Monday, August 24, 2015
Thursday, August 20, 2015
Tuesday, August 18, 2015
Sunday, August 9, 2015
Monday, August 3, 2015
Tuesday, June 16, 2015
Thursday, June 4, 2015
Tuesday, June 2, 2015
Monday, June 1, 2015
15 Top Websites to Learn AngularJS
http://www.techgig.com/readnews.php?category=Technology%2F+Skill+News&tgnews_link=http%3A%2F%2Ffeeds.dzone.com%2F~r%2Fdzone%2Ffrontpage%2F~3%2FFvF7eiCMsgA%2F15_top_websites_to_learn_angularjs.html&tg_type=rss&tgnews_id=56148
Tutorialspoint
GitHub
Thinkster.io
Year of Moo
AngularJS Tutorial by Todd Motto
Ng Book
Ng Newsletter
Egghead
W3schools
AngularJs On Codeacademy
Code School
AngularJS in 60 minutes
Medialoot
Medium.com
Friday, May 22, 2015
21 Best Free PHP and MySQL E-Books for Programmers
1) Learn PHP, MySQL, CSS, JavaScript and HTML5
2) PHP 5 Power Programming
3) Beginning Php5 Apache And Mysql Web Development
4) PHP5 And MySQL Bible
5) PHP and MySQL Web Development All in One
6) PHP 6/MySQL Programming for Absolute Beginner
7) PHP 6 Fast and Easy Web Development
8) PHP: The Basics
9) MySQL PHP Database Applications
10) Head First! PHP and MySQL
11) PHP6 and MySQL
12) Professional Lamp Linux Apache Mysql Php5
13) PHP the right way
14) The Oracle PHP Cookbook
15) Practical PHP Testing
16) Code Bright for Laravel PHP
17) Practical PHP Programming
18) PHP Programming
19) PHP Security Guide
20) Advanced CakePHP Tips
21) PHP Programming
Thursday, May 21, 2015
7 Mistakes You’re Making In Your Programming Career
1. Not having a clear goal
2. Not investing in non-technical or “soft skills”
3. Not being part of the community
4. Not specializing
5. Not investing in your personal brand
6. Not working on a side-project
7. Not having a plan for self-education
http://www.techgig.com/readnews.php?category=Technology%2F+Skill+News&tgnews_link=http%3A%2F%2Ffeeds.dzone.com%2F~r%2Fdzone%2Ffrontpage%2F~3%2F-blumiHjXmQ%2F7_mistakes_youre_making_in_your_programming_career.html&tg_type=rss&tgnews_id=55649
Tuesday, May 19, 2015
Monday, May 18, 2015
Sunday, May 17, 2015
Friday, May 15, 2015
Thursday, May 14, 2015
Wednesday, May 13, 2015
Tuesday, May 12, 2015
18 Best & Exclusive PHP Libraries For Developers to Use
http://phpdevelopmentsolutions.blogspot.in/2015/05/18-best-exclusive-php-libraries-for.html
18 Best & Exclusive PHP Libraries For Developers to Use
- See more at: http://phpdevelopmentsolutions.blogspot.in/2015/05/18-best-exclusive-php-libraries-for.html#sthash.jOMpM3DO.dpuf
Tuesday, May 5, 2015
Monday, May 4, 2015
Saturday, May 2, 2015
Tuesday, April 28, 2015
PHP 5.6 Features
From PHP 5.5 to 5.6
----------------------------------------
http://php.net/manual/en/migration56.new-features.php
1. Constant expressions
It is also now possible to define a constant array using the const keyword:
2. Variadic functions via ...
3. Argument unpacking via ...
4. Exponentiation via **
5. use function and use const
6. phpdbg
7. Default character encoding
8. php://input is reusable
9. Large file uploads
10. GMP supports operator overloading
11. hash_equals() for timing attack safe string comparison
12. __debugInfo() magic method has been added
13. gost-crypto hash algorithm
14. SSL/TLS improvements
15. pgsql async support
----------------------------------------
http://php.net/manual/en/migration56.new-features.php
1. Constant expressions
It is also now possible to define a constant array using the const keyword:
2. Variadic functions via ...
3. Argument unpacking via ...
4. Exponentiation via **
5. use function and use const
6. phpdbg
7. Default character encoding
8. php://input is reusable
9. Large file uploads
10. GMP supports operator overloading
11. hash_equals() for timing attack safe string comparison
12. __debugInfo() magic method has been added
13. gost-crypto hash algorithm
14. SSL/TLS improvements
15. pgsql async support
PHP 5.5 Features
From PHP 5.4 to 5.5
----------------------------------------
http://php.net/manual/en/migration55.new-features.php
http://www.techrepublic.com/blog/software-engineer/10-improvements-in-php-550-for-web-developers/
1. Generators added
2. finally keyword added
3. New password hashing API
4. foreach now supports list()
5. empty() supports arbitrary expressions
6. array and string literal dereferencing
7. Class name resolution via ::class
8. OPcache extension added
9. Apache 2.4 handler supported on Windows
10. Improvements to GD
Monday, April 27, 2015
Monday, April 20, 2015
Monday, April 6, 2015
Friday, April 3, 2015
Wednesday, April 1, 2015
Friday, March 20, 2015
URL Routing in PHP
How to Implement URL Routing in PHP
What is URL Routing?
URL Routing is a mechanism used to map URLs to the code that gets executed only when a certain request is received at the server.
Why you need URL Routing?
URL Routing makes your URLs considerably more meaningful. Suppose, you have a page that searches for books based on the author’s name. It may appear like this:
index.php?action=search&type=book&author=fitzgerald
Such type of URLs are difficult to understand and remember for the user. Therefore, to make these URLs more user friendly, you use ‘URL Routing’ and transform these URLs into simpler format.
/search/book/ftizgerald
Another great advantage of URL routing is found in Search Engine Optimization and there is no denying to the fact that strong SEO can enhance the positioning of your website and eventually profitability.
How to implement URL Routing in PHP?
The following guide will help you in implementing URL routing in PHP and Apache.
- First of all, make sure you have installed and enabled rewrite module in Apache’s configuration
- Now, we have to create a .htaccess file in root directory of our website
* Check, if the mod_rewrite has been enabled or not. If, yes then the following configuration will be used.
1 2 3 4
Options -MultiViews RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^ index.php [QSA,L]
* ‘RewriteEngine On’ enables the rewrite engine. Next, we will handle all the requests that do not correspond to the file names. After that, we will pass the requests to index.php file. Now, index.php will manage all the requests. - For every page request, index.php will be executed. In order to distinguish between the different requests, you will have to use $_SERVER['REQUEST_URI']
- Next, simply explode $_SERVER['REQUEST_URI'] with ‘/’ and you will get the substrings that will help you to compare and execute the code corresponding to them.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | /* The following function will strip the script name from URL i.e. http://www.something.com/search/book/fitzgerald will become /search/book/fitzgerald */ function getCurrentUri() { $basepath = implode('/', array_slice(explode('/', $_SERVER['SCRIPT_NAME']), 0, -1)) . '/'; $uri = substr($_SERVER['REQUEST_URI'], strlen($basepath)); if (strstr($uri, '?')) $uri = substr($uri, 0, strpos($uri, '?')); $uri = '/' . trim($uri, '/'); return $uri; } $base_url = getCurrentUri(); $routes = array(); $routes = explode('/', $base_url); foreach($routes as $route) { if(trim($route) != '') array_push($routes, $route); } /* Now, $routes will contain all the routes. $routes[0] will correspond to first route. For e.g. in above example $routes[0] is search, $routes[1] is book and $routes[2] is fitzgerald */ if($routes[0] == “search”) { if($routes[1] == “book”) { searchBooksBy($routes[2]); } } |
This is how you will be able to implement minimal URL routing mechanism. There are a plenty of PHP frameworks that provide enhanced URL Routing features and you can try them as well.
Tuesday, February 24, 2015
How To Become A Successful Software Developer: 13 Steps
http://www.techgig.com/tech-news/editors-pick/How-To-Become-A-Successful-Software-Developer-13-Steps-29277?mailer_id=2181&utm_source=Mailer&utm_medium=TG_batch&utm_campaign=digest_news_2015-02-23&email=ndlganeswararao@gmail.com&activity_name=Mjk4NzA=&template_type=3&dt=&auto_login=bmRsZ2FuZXN3YXJhcmFvQGdtYWlsLmNvbUAjJEAjJDUzNDM1M0AjJEAjJDEzODQ0NjE2MTE=&src_type=autoLogin
or
or
Software Development is no longer considered as an art. But it was
made as an engineering practice. A successful software developer is a
person who is able to write each line of code with passion. And passion
cannot be obtained by any software engineering degree, it must come from
within yourself.
1.Be passionate about the being a software developer.
If you are not passionate for sitting in front of the PC for the whole
day, simply enjoying the lines of code you write; this is not for you.
2.Always start with the simple hello world.
3.Don't try to learn all the programming languages. What you need to know is the concepts.
4.Don't start programming with a languages such as C/C++. Try something like Java or C Sharp.
5.When you face an error.
Always tell to yourself, "I'm NOT ALONE, Someone in this world should
have faced the same error before". And GOOGLE the exact error message.
Chances are 99% you will find the answer.
6.Be more public.
If you will not show others that you are cool and you deserve more, how
will they know? There is simple way to do that - start blogging, ask
and answer questions, ensure Google knows something about you. Share
your knowledge in your team and project. If you learned something new,
why do not share it. You will forget it if will not be trying it.
7.Never use Microsoft notepad to do coding. Use at least Notepad++.
8.When you see an application(web application or windows), tell yourself. If this is an application. Then it's technically possible for me to build a similar one.
9.When you see an application(web application or windows), try to model it in your mind.
Always ask yourself, can you build a similar application yourself. If
not try to find the place where you think you might get stuck. And try
to Google and find how to do it.
10.If
you get stuck in a code logic for more than two hours; STOP your work;
go out to have a tea or coffee, before trying it again.
11.Be confident. Help others and ask from others. Different people will have different aspects to solve an issue.
12.Never be ashamed, when you find the bug as a single line of code.
Usually most of the bugs can be corrected in a single line of code.
What matters is, how hard you tried in different aspects to solve the
issue.
13.Find a mentor. This
does not mean that you a need a person who will help you in doing your
job - it is a coach or a more senior staff then you are. This means that
you need a person who stays where you want to be and you need to take a
leaf from his/her book. And if he will not be high enough - you will
need to find another. But all the time you need to have that person.
Also have people, friends if you will, who will help you keep on track.
It could be your wife or girlfriend , or best friend who always supports
you (in my case he is a developer, but this doesn't matter).
Thursday, February 19, 2015
Monday, February 9, 2015
Thursday, February 5, 2015
Thursday, January 1, 2015
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