By Joseph Benharosh
Item orientated programming got here overdue to Hypertext Preprocessor. it's been round in different languages like C++, Ruby, Python and JavaScript much longer, yet its call for in Hypertext Preprocessor is changing into superior. With that call for for the programming sort there's an expanding call for for builders who can application in item orientated personal home page. and people programmers quite often earn significantly greater than their fellow internet builders whose historical past is simply constrained to procedural PHP.
But this doesn't inform the total tale. think about the subsequent proof :
Procedural programming is inefficient
PHP frameworks depend on item orientated PHP
Drupal and different CMS structures at the moment are item oriented
There are increasingly more components of WordPress changing into item oriented
Let's extend at the first truth because it is crucial one - every thing else flows from it, i.e. item orientated programming is rising in popularity since it is extra effective. There are nice functions written within the procedural form of Hypertext Preprocessor, yet even the simplest prove in spaghetti code the place features and variables are combined jointly. upload in HTML, CSS and JavaScript to this combination and the code turns into anything that's, good, inefficient. item orientated code is extra equipped. exact devices are created for a unmarried objective. this suggests it truly is more uncomplicated to discover issues within the code (ending these days of spending hours trawling via traces of spaghetti code to discover a unmarried element). it's also more straightforward so as to add, exchange or get rid of components of code because it purely should be performed as soon as. With procedural programming, nevertheless, it is vital to alter each example. ultimately, item orientated programming supplies the chance to builders to combine code libraries from different assets. this is often kept away from being concerned approximately identify collisions, although a number of the features within the code may have an identical identify.
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When we override the class’s properties and methods, we rewrite a method or property that exists in the parent again in the child, but assign to it a different value or code. In the example given below, we create a hello() method in the parent class that returns the string "beep" and override it in the child class with a method by the same name that returns a different string, "Hallo". Here is the code: // The parent class has hello method that returns "beep" class Car { public function hello() { return "beep"; } } // The child class has hello method that returns "Hallo" class SportsCar extends Car { public function hello() { return "Hallo"; } } // Create a new object $sportsCar1 = new SportsCar(); // Get the result of the hello method echo $sportsCar1 -> hello(); Result: Hallo The result reflects the fact that the hello() method from the parent class was overridden by the child method with the same name.
Tank . 2 gal. Conclusion In this chapter, we learned that we can chain properties and methods to provide for a fluent code and improve its readability. In the next chapter, we will learn how to restrict access to the properties and methods inside our classes. Chaining methods and properties 24 Let’s practice what we have just learned Let’s now add some methods to represent register and mail functionality to the User class that we had written in the previous chapters. These methods would echo a string as placeholder for their actual purpose.
I>' . $this -> style . ''; } } Inheritance in object oriented programming 41 // Create an instance from the child class $sportsCar1 = new SportsCar(); // Use a method that the child class inherited from the parent class $sportsCar1 -> setModel('Ferrari'); // Use a method that was added to the child class echo $sportsCar1 -> driveItWithStyle(); Result: Drive a Ferrari fast and furious. The protected access control modifier When we declare a property or a method as protected, we can approach it from both the parent and the child classes.
The essentials of Object Oriented PHP by Joseph Benharosh
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