PHP OOP Terms Explained - Part 2

Below I tried to explain some other PHP Object Oriented Programming terms. Feel free to ask questions.

Here is the first part : OOP Terms - Part 1

•     We can create multiple object from the same class. Like,

a.     $rahim = new Person();

b.     $karim = new Person();

                                                              i.      $rakim->set_name(‘Nas’);

                                                            ii.      $karim->set_name(‘Eminem’);

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•  After that we can access an object’s data.

echo “My name is: ”. $rakim->get_name();

•       Constructors are one kind of special methods.

•      'construct' method starts with two underscores (__) and the word 'construct'.

•      Remember, in a class       

a.     Functions = methods

b.     Variables = properties

•      Constructor is a special kind of method which must be executed.

•      We can use access modifiers to control the access to properties and methods.

•      If we do not defined as public, protected or private, it will be assumed as public.

•        If the property is ‘private’, only that containing class can access the property.

•      If the property is ‘protected’, only that class and extending child class can access that property.
• 
  
•       If the property is ‘public’, it can be accessed from anywhere.

 Inheritance:

Inheritance helps us to reuse our code. By using inheritance, we can use a base class by extending it into the child class. 

Such as:

class employee extends person {

            function function_name() {

            //function_definition;

}

}

3   Here employee is the child class and person is the parent or base class.

1    Method overriding:

When we want to change the activities or behavior of a base class method in child class, we can re-declare it in our child class using our own necessity. It is called method overriding.