Use of Constructor in PHP

A constructor allows you to initialize an object's properties upon creation of the object. If you create a __construct() function, PHP will automatically call this function when you create an object from a class.

1. What is the use of constructor?
2. How constructor is used in PHP with example?
3. What is the use of destructor in PHP?
4. Does PHP class need constructor?
5. What is the advantages of constructor?
6. Can constructor be private?
7. What is PHP reflection?
8. How many types of constructors are there in PHP?
9. What is overriding in PHP?
10. What is name space in PHP?
11. What is difference between constructor and destructor?
12. What is polymorphism PHP?

What is the use of constructor?

The purpose of constructor is to initialize the object of a class while the purpose of a method is to perform a task by executing java code. Constructors cannot be abstract, final, static and synchronised while methods can be. Constructors do not have return types while methods do.

How constructor is used in PHP with example?

Constructor in PHP is special type of function of a class which is automatically executed as any object of that class is created or instantiated.
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Constructor in PHP with example ?

1. class Bird.
2. public $bird_name = "No any birds for now";
3. public function __construct($bird_name)
4. $this->bird_name = $bird_name;

What is the use of destructor in PHP?

A destructor is called when the object is destructed or the script is stopped or exited. If you create a __destruct() function, PHP will automatically call this function at the end of the script.

Does PHP class need constructor?

You are not required to define a constructor in your class, but if you wish to pass any parameters on object construction then you need one. __construct() is the method name for the constructor. The constructor is called on an object after it has been created, and is a good place to put initialisation code, etc.

What is the advantages of constructor?

One of the benefits of using a constructor over a method is that you can be assured the constructor was called and the work within the constructor was performed. The language specifies that to construct an object a constructor must be called.

Can constructor be private?

Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.

What is PHP reflection?

PHPWeb Development. Reflection is generally defined as a program's ability to inspect itself and modify its logic at execution time. In less technical terms, reflection is asking an object to tell you about its properties and methods, and altering those members (even private ones).

How many types of constructors are there in PHP?

Even the values to properties of the class are set by Constructors. Constructor types: Default Constructor:It has no parameters, but the values to the default constructor can be passed dynamically. Parameterized Constructor: It takes the parameters, and also you can pass different values to the data members.

What is overriding in PHP?

In function overriding, both parent and child classes should have same function name with and number of arguments. It is used to replace parent method in child class. The purpose of overriding is to change the behavior of parent class method. The two methods with the same name and same parameter is called overriding.

What is name space in PHP?

Namespaces are qualifiers that solve two different problems: They allow for better organization by grouping classes that work together to perform a task. They allow the same name to be used for more than one class.

What is difference between constructor and destructor?

Constructor is used to initialize the instance of a class. Destructor destroys the objects when they are no longer needed. Constructor is Called when new instance of a class is created. Destructor is called when instance of a class is deleted or released.

What is polymorphism PHP?

Polymorphism is simply an OOP design pattern that allows multiple class with various functionalities to implement or share a common Interface. ... Polymorphism in PHP is implemented using the interface pattern. Think about interface as the skeleton or blueprint for your class which implements it.