Composer and Effective PHP Patterns

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object oriented design patterns in php

object oriented design patterns in php


Object Oriented Design Patterns in PHP 7

Gang of Four!

How about starting this discussion by quoting from them?

Their famous book “Design Patterns, Elements of Reusable Object-Oriented Software”; and they are Erich Gamma, Richard Helm, Ralph Johnson and

John Vlissides.

The book starts with this meaningful statement— “Designing object-oriented software is hard, and designing reusable object-oriented software is even harder. You must find pertinent objects, factor them into classes at the right granularity, define class interfaces and inheritance hierarchies, and establish key relationships among them.

Your design should be specific to the problem at hand but also general enough to address future problems and requirements. You also want to avoid redesign, or at least minimize it. Experienced object-oriented designers will tell you that a reusable and flexible design is difficult if not impossible to get “right” the first time. Before a design is finished, they usually try to reuse it several times, modifying it each time.

Yet experienced object-oriented designers do make good designs. Meanwhile, new designers are overwhelmed by the options available and tend to fall back on non-object-oriented techniques they’ve used before. It takes a long time for novices to learn what good object-oriented design is all about. Experienced designers evidently know something inexperienced ones don’t. What is it?”

This introductory paragraph ends with a question mark.
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How Composer has Revolutionized the PHP World

If you plan to design object-oriented software, it is hard, and, designing reusable object-oriented software is even harder. How can a dependency management system like Composer make this task easier? Let us try to understand that in this chapter. We will see more usages of Composer, as we read in the next chapters.
Composer’s role in Effective Patterns

I would like to start this section by quoting from the famous book “Design Patterns, Elements of Reusable Object-Oriented Software” by the “Gang of Four” Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides.

Continue reading

Single Responsibility Principle in PHP

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“Single Responsibility Principle” or SRP is one of the most important concepts in object-oriented design. Whether you are a novice or an experienced designer, you must know and follow this principle if you want to make your objects loosely coupled; in software designing it is important to understand. Most often the inexperienced designers do not understand this core concept. And, it makes a real big difference in the time of making an application.
I have written a long article on the same topic in Medium

Composer’s role in Effective Patterns

I would like to start this section by quoting from the famous book “Design Patterns, Elements of Reusable Object-Oriented Software” by the “Gang of Four” Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides.
The book starts with this meaningful discussion – “Designing object-oriented software is hard, and designing reusable object-oriented software is even harder. You must find pertinent objects, factor them into classes at the right granularity, define class interfaces and inheritance hierarchies, and establish key relationships among them. Your design should be specific to the problem at hand but also general enough to address future problems and requirements. You also want to avoid redesign, or at least minimize it. Experienced object-oriented designers will tell you that a reusable and flexible design is difficult if not impossible to get “right” the first time. Before a design is finished, they usually try to reuse it several times, modifying it each time.

Continue reading

Horizontal reuse of code in php

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The object-oriented programming is all about effective planning and design and interface plays the role of a blueprint; traits help objects to implement that blueprint. Going overboard with traits break that effectiveness.
Let us try to understand that point in the light of our selling application. Consider this code.

//iDeliveryParty.php
namespace MyInterface;

interface iDeliveryParty {
function get($product);
function post($review);
}

However, not every user may want to post a review. In that case, the traits will come to our help for not only implementing the interface but also enhance the re-usability of the code.
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Autoload versus PSR4

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Auto-loading classes in PHP is super-easy; there are several ways to solve this problem, you could either create your own autoload function like this:

<?php
$autoload_function = function($classname){
$fileName = __DIR__ . "/" . "{$classname}.php";
if(file_exists($fileName)){
require_once "{$fileName}";
}
};

Or, you can use the built-in functions like this:

spl_autoload_register($autoload_function);

However, this does not solve the problem where we need to use lots of classes, maybe hundreds or thousands of classes that are interconnected; think about a big application. The effectiveness of a big application depends on many factors and one of them is the relationship between the file structure and the auto-loading classes. This relationship should be congenial. The namespace will help us solve the problem, but if we try to adopt the traditional methods, it will unnecessarily make things tedious.
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What is the main difference between object oriented programming and procedural programming

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When the programming language itself is set up to do the organizational structure in an object-oriented way, it becomes interestingly different from the traditional procedural coding. The most effective part of object-oriented programming is that the data objects can be built using data members and data functions together.
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Session in php

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To get Books of Sanjib Sinha…

About the Author….

Web pages hold temporary data. To make it dynamic, we can store
our data on the server. We can use session to achieve this special
feat.
To work with session, we can store and retrieve data by its
name.
We start with a simple session_start() function.

Consider someone has logged in by filling out a form. We can
keep or store that name just by starting session. It is something like
– you have issued a ticket to someone who can now enter your
application and stay there for some time. When his or her session
ends, the user has to leave.
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vmware mouse click not working

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Sometimes you try to run metasploitable in your Virtual Machine or vmware, and you find that your mouse click is not working any more.
What can you do?

vmware-mouse-click-not-working

vmware-mouse-click-not-working


In the above image similar things are seen.
Once you click your mouse on the metasploitable terminal to type username and password, your mouse click just vanishes into blue!
There are several solutions described on the Internet, including uninstalling software like audio driver etc.
You don’t have to uninstall anything from your host machine.
Just press “Ctrl+Alt+Esc” and your mouse click will start acting again.