PHP Classes and Objects

ExamplePHP

<?php
class Person {
  public function __construct(private string $name, private int $age) {}

  public function birthday(): void {
    $this->age++;
  }

  public function describe(): string {
    return "{$this->name} is {$this->age}";
  }
}

$p = new Person("Ada", 36);
$p->birthday();
echo $p->describe(), "\n";

Output

Ada is 37

$this refers to the current object. Putting private in the constructor parameters (constructor promotion) declares and assigns the properties in one go.

Quick check

What does $this refer to?

The current objectThe class nameThe parent class

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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