This is a basic hello world example for the composer tutorial. App/HelloWorld.php

HelloWorld.php

<?php

namespace App;


class HelloWorld
{
  private $msg = 'Hello World';
  
  public function __construct($msg = '')
  {
    if('' !== $msg){
     $this->msg = $msg;
    }
  }

  public function __toString()
  {
    return $this->msg;
  }

}