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Object-Oriented Programming in PHP

Solution Review: $this Keyword

Explore how to use the $this keyword in PHP to access class properties and chain methods within a class. Understand creating objects, setting public properties, and invoking methods that reference those properties to produce dynamic outputs. This lesson helps you master key object-oriented programming concepts crucial for effective PHP development.

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Solution

PHP
<?php
class User 
{
  public $firstName; 
  public $lastName;
  
  public function hello() {
    return "hello, " . $this -> firstName; 
  }
}
function test() 
{
    $user1 = new User();
    $user1 -> firstName = 'Jonnie';
    $user1 -> lastName  = 'Roe';
    return $user1 -> hello();
}
echo test();
?>

Explanation

  • Line 2: We write the User class with public properties as $firstName and $lastName.
  • Line 7: We add the hello() method to the User class. This method uses the $this to approach the $firstName property of the class and returns the message hello, firstName. Here, firstName will be
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