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Object-Oriented Programming in PHP

Solution Review: Chaining Methods and Properties

Explore how to implement method chaining in PHP using the $this keyword within class methods. Understand how to return the current object to enable chaining of multiple methods, demonstrated through a User class example with properties and methods like hello, register, and mail. This lesson helps you write more fluent and readable object-oriented PHP code.

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Solution

PHP
<?php
class User {
  public $firstName;
    
  public function hello() {
    echo "hello, " . $this -> firstName; 
    return $this;
  }
  public function register() {
    echo " >> registered";
    return $this; 
  }
  public function mail() {
    echo " >> email sent"; 
  }
}
function test()
{
    $user1 = new User();
    $user1 -> firstName = "Jane";
    $user1 -> hello() -> register() -> mail();
}
test();
?>

Explanation

  • Line 2: We write the User class with $firstName as a public property.
  • Line 5: We write the hello() method that says hello to the user. We return $this
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