PHP OBJECT ORIENTED PROGRAMMING BOOK
Junade Ali wrote an e-book called Object-Oriented PHP on using mature OOP How can I learn advanced PHP object-oriented programming?. PHP Advanced and Object-Oriented Programming: Visual QuickPro Guide (3rd . programming, nor, have I found a book that teaches all the concepts of OOP. Object-Oriented PHP shows developers how to take advantage of the new Working within the context of concrete examples, the book begins with code compatible with PHP - Selection BASICS OF OBJECT-ORIENTED PROGRAMMING.
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PHP and Object-Oriented Programming All the forces in the world are not so powerful as an idea whose Selection from Learning PHP Design Patterns [ Book]. This book acts as a guide to using mature OOP practices in modern PHP to build Advanced Object-Oriented Programming (Advanced OOP, Magic Methods. Learn and understand PHP OOP so that you can start building amazing Web Learn and understand PHP Object Oriented Programming. OOP . Program started with a class Book after that all the concepts extends the same.
An instance, is a class that we can use. We can have multiple instances of the same class. It's something that's really hard to explain in text, so let's look at a code sample. We do this using the new keyword, and then the class name that we wish to instantiate.
Now that we have an instance of class, we can play with its properties. Let's start by setting the properties for our book. Next, you specify the name of the property that you wish to access. We can also retrieve them using the object operator. Let's echo each of our class properties, appended with a newline character. Executing our code yields the following output.
Game of Thrones George R R Martin Voyager Books Earlier, I mentioned that we can have multiple instances of classes, so lets define two books, each with different properties. I'm going to omit the class declaration for now, just to simplify the examples. They both have their own unique set of properties. They are individuals.
What we've done, is created a complex storage mechanism for information. Right now, our classes don't have a huge advantage over using an array to store this information. Why don't we unlock some other secrets that classes have to offer? Default Values Our classes are blueprints for new instances of objects.
Sometimes, the values that we expose may have defaults. For example, the majority of books will be in a paperback format. However, rarely, you may need to mark a book as hardback format. Let's add a format property to our book class. We can save time for ourselves by giving the class property a default value of 'Paperback'. Let's examine the following code snippet. This line ends with a semicolon. What response to we receive? Paperback Just as expected!
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Of course, we're free to change this value if we please. It's simply a default to help simplify the process of creating books. Hardback Great! You can set your default values to all scalar types including strings, ints, floats and even arrays with multiple values, both associative and indexed. There's one catch though, remember, there's always a little catch. When defining your default values, you can't set them to the results of functions.
Similarly we can imagine our car made of different objects like wheel, steering, gear etc.
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Same way there is object oriented programming concepts which assume everything as an object and implement a software using different objects.
You can think of a class as a template for making many instances of the same kind or class of object. You define a class once and then make many objects that belong to it. Objects are also known as instance.
This data will be invisible to the outside of the class and can be accessed via member functions. These variables are called attribute of the object once an object is created. Here child class will inherit all or few member functions and variables of a parent class. This is also called a base class or super class. This is also called a subclass or derived class. For example function name will remain same but it take different number of arguments and can do different task.
Similarly functions can also be overloaded with different implementation. A set of braces enclosing any number of variable declarations and function definitions. Function definitions look much like standalone PHP functions but are local to the class and will be used to set and access object data.
Creating Objects in PHP Once you defined your class, then you can create as many objects as you like of that class type. Following is an example of how to create object using new operator.
Computer programs are designed to solve human problems. A process called dynamic programming is a technique for breaking down larger problems into smaller ones.
The plan is to solve each smaller problem and then put everything back together into a single, larger solution. Take, for example, planning a trip to Timbuktu.
Are there flights into TOM? Flights are available from both Bamako and Mopti, but Islamist rebels took control of Timbuktu as of July 1, , and flights have been canceled until further notice. Are hostile rebels in control of Timbuktu now? If flights are available, is Timbuktu safe for tourism or business? Are visas from my country into Mali country where Timbuktu is located available?
As you can see, getting to and from Timbuktu is a complex issue, but the list of simple questions can all be answered by yes or no. Lots more questions would be included in the list, but each can be answered in a binary fashion. The process of decomposing a problem into small subproblems is the process of modularization.
The more complex the problem, the more it makes sense to modularize it.
So, the initial reasoning in OOP programming, far from being complex, simplifies the complex. Even the most daunting programming problem can be solved by this divide-and-conquer strategy. Once a problem is modularized, what are you going to do with the modules?
As you saw, breaking down a complex problem can transform it into many simple subproblems, but you need a way to organize the modules and work with them in relation to each other to handle the larger problem being solved. One way to look at a module is as a collection of related functions.
In programming, these modules are called classes.
A class itself is made up of parts called properties and methods. The properties are different types of data objects like numbers, strings, nulls, and Booleans. Generally, the data are stored as abstract data types known as variables, constants, and arrays. Methods , on the other hand, are functions that operate on the data. One way to think of a class is as a collection of objects with common characteristics.
Keeping in mind that the purpose of a module is to solve some aspect of a more complex problem, we arrive at one of the first principles of object-oriented programming: By limiting a class to a single responsibility, we not only remind ourselves of why we modularized the problem, but we also have an easier way of organizing the modules. The TellAll class in the following listing demonstrates a class with a single responsibility—to provide information about the user agent viewing the PHP page:.
The class represents a module of a more complex operation, of which the class is only a single part. Like a good class in OOP, it has a single responsibility—finding information about the user agent. The constructor function in a class automatically launches as soon as the class is instantiated. In the TellAll class, the results are immediately printed to the screen, whether you want them there or not.
So, as you will see, not all classes include a constructor function. In the TellAll class, I included a little trigger at the bottom to launch the class. With the exception of the Client class, self-launching is not recommended. Similarly, PHP files containing classes should be used by other modules classes and not self-launched.
The Client has different roles in the larger project, but the primary one is to make requests from the classes that make up the design pattern. Here, the Client is shown in relation to a revised version of the TellAll class. This new class used by the Client is different in several ways from TellAll that are more useful to an overall project and reusable in other projects.
The MobileSniffer class begins with the same user agent information, but the class makes it available in more useful ways with its properties and methods.
6 Great Books for Learning PHP Object-Oriented Programing
Had a Client class instantiated automatically, the Client would have fewer options for how to use the MobileSniffer information. Take a look at the following listing to see how to create the class:.
I work in a university environment where the system administrators often are students with varying levels of knowledge and competence , still honing their craft.
As a result, I got into the habit of adding the following lines to the beginning of my code:. For some, such added lines of code are annoying, but I include them in the Client class to provide a reminder of how important error reporting is in developing applications where feedback is essential. Learning OOP and design patterns relies heavily on such feedback.
In order to use the MobileSniffer , the Client instantiates the class and uses its methods as shown in the following listing:. Using the Client class provides a way to make the MobileSniffer class more useful. The MobileSniffer does not have to launch itself, and using a return statement, any class that calls MobileSniffer just gets the data.
The Client can then use that data in any way it wants. We could have formatted the data in the MobileSniffer class, but then it would not have been as flexible or useful. By allowing the Client to use the data in the most general way, it could do any number of things with it.
Had the data been preformatted in the MobileSniffer class, using it for identifying a CSS file would require stripping away the unneeded formatting.Likewise, having to revise an entire program because of a few lines of added code is an equally expensive use of time.
At some point you will see the value. By allowing the Client to use the data in the most general way, it could do any number of things with it.
Even capturing the device may not be enough because some like the iPad and the iPad Mini have different screen resolutions in addition to different screen sizes. Methods are what we call functions that belong to classes. We echo the values for loudName for each of the panda instances and receive I'm going to omit the class declaration for now, just to simplify the examples. You can use it to access class properties and other methods from within a class method.
However, for getting from one side of the country to the other, flying in a jet works much better.
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