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Object-oriented programming is perhaps the dominant development paradigm for leading languages including Java, C#, and Python. The rich class and inheritance framework wasn’t fully implemented in modern PHP until 2015, and best practices for object-oriented programming are still emerging.

This course is an introduction to object-oriented programming in PHP. You’ll start with the basics of the OOP paradigm and get familiar with classes, objects, methods, and properties. You’ll then chain methods and properties using the this keyword before working with access modifiers and magic methods. With these basics down, you’ll take a deep dive into object-oriented programming in PHP, including inheritance, abstraction, polymorphism, and namespaces. After exploring exception handling, you’ll use these object-oriented techniques to build, manage, and edit a PHP database.

By the end of this course, you’ll be prepared to build dynamic server-side applications using object-oriented programming in PHP.

Object-Oriented Programming in PHP

**(Fill in the blank)** We use the `private` access modifier in order to ___________.

(Fill in the blank) We use the <code>private</code> access modifier in order to ___________.

Which access modifier should be used with getter/setter methods?

Which access modifier should be used with getter/setter methods?

`The house color is not in our list of colors`

What is the output of the following code?
```
class House {
  private $color;

  public function setColor($color){
    $allowedColors = ["White", "Grey"];
    if(in_array($color,$allowedColors))
      $this -> color = $color;
    else
      $this -> color = "not in our list of colors";
  }

  public function getColor() {
    return "The house color is " . $this -> color; 
  }
}

$myHouse = new House();
$myhouse -> setColor("Yellow");
echo $myHouse -> getColor();
```

What is the output of the following code?
<pre><code>class House {
 private $color;

 public function setColor($color){
 $allowedColors = [&quot;White&quot;, &quot;Grey&quot;];
 if(in_array($color,$allowedColors))
 $this -&gt; color = $color;
 else
 $this -&gt; color = &quot;not in our list of colors&quot;;
 }

 public function getColor() {
 return &quot;The house color is &quot; . $this -&gt; color; 
 }
}

$myHouse = new House();
$myhouse -&gt; setColor(&quot;Yellow&quot;);
echo $myHouse -&gt; getColor();
</code></pre>

`My house color is Yellow and it has 2 entrances`

`My house color is Yellow and it has 0 entrances`

What is the output of the following code?
```
class House {
  public $color;
  private $countOfEntrance;
}

$myHouse = new House();
$myHouse -> color = "Yellow";
$myHouse -> countOfEntrance = 2;
echo "My house color is " . $myHouse -> color . " and it has " . $myHouse -> countOfEntrance . " entrances";
```

What is the output of the following code?
<pre><code>class House {
 public $color;
 private $countOfEntrance;
}

$myHouse = new House();
$myHouse -&gt; color = &quot;Yellow&quot;;
$myHouse -&gt; countOfEntrance = 2;
echo &quot;My house color is &quot; . $myHouse -&gt; color . &quot; and it has &quot; . $myHouse -&gt; countOfEntrance . &quot; entrances&quot;;
</code></pre>

What is the output of the following code?

```
<?php
class User {
 public $age = 22;
 private $name = "Johnny";

 public function setName($name)
 {
 $this -> name = $name;
 }

 public function getName() {
 return $this -> name; 
 }
}

$user1 = new User();
$user1 -> setName("John");
echo $user1 -> getName();

?>
```

What is the output of the following code?
<pre><code>&lt;?php
class User {
 public $age = 22;
 private $name = &quot;Johnny&quot;;

 public function setName($name)
 {
 $this -&gt; name = $name;
 }

 public function getName() {
 return $this -&gt; name; 
 }
}

$user1 = new User();
$user1 -&gt; setName(&quot;John&quot;);
echo $user1 -&gt; getName();

?&gt;
</code></pre>

What is the output of the following code?

```
<?php
class A
{
 public $i = 1;
 public $j = 2;
 protected $k = 4;

 public function __construct($val) {
 $this -> i += $val;
 }
}
class B extends A
{
 public function __construct($val) {
 $this -> j += $val;
 }

 public function incrementK($val)
 {
 $this -> k += $this -> j + $val;
 $this -> j -= $val;
 }
}

$a = new A(5);
$a = new B(10);
$a -> incrementK(4);
echo $a -> j;
?>
```

What is the output of the following code?
<pre><code>&lt;?php
class A
{
 public $i = 1;
 public $j = 2;
 protected $k = 4;

 public function __construct($val) {
 $this -&gt; i += $val;
 }
}
class B extends A
{
 public function __construct($val) {
 $this -&gt; j += $val;
 }

 public function incrementK($val)
 {
 $this -&gt; k += $this -&gt; j + $val;
 $this -&gt; j -= $val;
 }
}

$a = new A(5);
$a = new B(10);
$a -&gt; incrementK(4);
echo $a -&gt; j;
?&gt;
</code></pre>

Test your understanding of access modifiers.



Quiz: Access Modifiers

Test your understanding of access modifiers.

Introduction

Classes and Objects

Using the $this Keyword for Chaining Methods and Properties

Access Modifiers

Magic Methods and Constants Unveiled

Inheritance in Object-oriented Programming

Abstract Classes and Interfaces

Polymorphism and Type Hinting

Static Methods & Properties and Traits

Namespaces & Dependency Injection

Exception Handling

PHP Database

Model-view-controller (MVC)

Conclusion

Appendix

Quiz: Access Modifiers