Classes

Define a class

Properties and methods live on the class. Construct with new.

<?php
class User {
  public string $name;

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

  public function label(): string {
    return "User: {$this->name}";
  }
}

$u = new User("Ada");
echo $u->label(), "\n";

Visibility

Use public, private, and protected to control access.

class Counter {
  private int $n = 0;
  public function inc(): void { $this->n++; }
  public function value(): int { return $this->n; }
}

Inheritance briefly

A class can extend another with extends.

OOP tips

• One class per file is a common PSR style
• Name classes in StudlyCase
• Keep constructors light
• Learn interfaces and namespaces as projects grow