# Overview
**Object Oriented Programming** is a programming concept where real-world items are given abstract groupings called a **class**. Subgroups known as **subclasses** can be made from the larger groups as well. 

Classes have basic descriptive variables and methods for each item, what does, and how it is created. These distinct items are known as **objects**, which may have characteristics derived from the class as well as others that are unique to it.

For example, consider a class called "footwear". This class has subclasses, and it is made up of members which are similar in many ways. Some subclasses of footwear may be:
* Shoes
* Sandals
* Boots
* Flip flops

These subclasses can have specific items with the same characteristics and properties. Some of these objects in the shoe subclass may be loafers, sneakers, or oxford shoes. 


# Creating an object in PHP

The basic description given in the diagram above is used every day by developers to write object-oriented code, where there is a logical thought process that consists of: 
1. Identifying program components that will eventually perform similar functions.
2. Creating these program components with their properties/attributes and functions/methods.
3. Identifying unique use cases for each component and applying them to solve such issues.

Consider `mysqli` classes in PHP. These have functions like `query`, `connect`, and `num_rows`, as well as properties like database names, host names, passwords, and user information.

Objects which are unique use cases of these classes can be new database connections from the `mysqli` class. These new objects can access all methods and properties of this class. 

# Creating a new `mysqli` object
To create a new object in PHP, you must use the `new` keyword.
## Syntax 
```
$objectName = new className();
```

# Code
In the code below, a new `mysqli` object was created. This new object now has access to the class methods using the arrow `->` symbol.

<?php

$dbconn = new mysqli("localhost", "root", "","mydb");
//i can access methods in mysqli class like below
if($dbconn -> connect_error){
  // do something
}
?>

In the next code block, I created my own custom class with some properties and methods. Then I used the `new` command to create some instances of class objects. With the help of the arrow `->` symbol, these objects can make use of the methods available in the `house` class.

<?php 
class house {
  // Properties
  public $name;
  public $size;

  // Methods
  function set_name($name) {
    $this->name = $name;
  }
  function get_name() {
    return $this->name;
  }
}

$condo = new house();
$duplex = new house();
$condo->set_name('personal condo');
$duplex->set_name('detached duplex');

echo $condo->get_name();
echo "\n";
echo $duplex->get_name();
?>

How to create an object in PHP

Create PHP objects using the `new` keyword. Access class methods and properties via the `->` symbol.

How to create an object in PHP

Overview

Creating an object in PHP

Creating a new mysqli object

Syntax

Code

Creating a new `mysqli` object