Use static function to call internal function

Use static function to call internal function.md

Instead of doing this

  $p = new PurchasePodcast;
  $p->handle();

This feels better

  PurchasePodcast::perform();

class PurchasePodcast
{
  public static function perform()
  {
    return (new static)->handle();
  }
  
  private function handle()
  {
    // ...
  }
}