php structural design pattern extended class not found - php

Question

Whenever I try to extend a class I end up with
Fatal error: Class 'home\register\Create' not found in C:\xampp\htdocs\project\home\register\register.php on line 8
I have 2 file classes under the same directory first one an abstract class Create :
<?php
namespace home\register;
use home\libs\Tools\Sanitize\Sanitize as sanitize;
abstract class Create
{
public $sanitize;
function __construct ()
{
$this->sanitize = new sanitize();
if (isset($_POST)){
foreach ($_POST as $key => $value){
if (!empty($_POST["$key"])){
$this->$key = $this->sanitize->clean($value);
}
}
}
}
abstract function db_query($pdo_db_name, $password, $query, $host = 'localhost');
}
And a second class register which extends Create:
<?php
namespace home\register;
use PDO as pdo;
use home\libs\MainLogger\MainLogger as logger;
class register extends Create //Line 8 Error is thrown when extending the class
I can post the whole code but I doubt the problem is there. I've been trying to adapt to the structural design pattern as I see it as the tidiest way of handling a lot of classes

Answer 1

Right now
You'll need to ensure that Create is loaded before you can extend it in register.php. The simplest way to do this is using require_once, by adding something like:
require_once(__DIR__ . '/Create.php');
to the top of register.php. This should be sufficient for now.
Maybe later
Once you start to get into loading many classes, you may want to look at using an autoloader. From my experience the most flexible way to do this is to convert the project to using composer, and then using the autoload configuration item.
The layout of your classes (not including ones not shown in this question) would be something like:
src/register/Create.php
src/register/register.php
and, to match this, your composer.json would look something like:
{
"autoload": {
"psr-4": {"home\\": "src/"}
}
}
You can then generate the autoloader by running:
composer dump-autoload
and use it in the entry point to your project by adding:
require_once('vendor/autoload.php');
From this point on, you would not need to add individual require_once lines for each file, provided you re-ran dump-autoload after adding new classes to your source.