Kurvára nem értem.

Endre,csakhogy ne szerencsétlenkedj még egy hétig a kibaszott PSR-4 dokumentáció olvasgatásával, íme egy rövid összefoglaló a guidelines-oknak, csak itt, csak neked:
PSR-4 (PHP Standard Recommendation 4) is an autoloading standard designed to improve the interoperability of PHP code by specifying how classes should be loaded. Here is a summary of the PSR-4 coding standards:

### Basic Principles

1. **Namespace Structure**:
- The namespace of a class must match the directory structure where the class file is located.
- Each namespace separator (`\`) corresponds to a directory separator (`/`).

2. **Base Directory**:
- A base directory is specified for the namespace prefix.
- The files for the classes in the namespace are located in the base directory.

### Key Rules

1. **Namespace Prefix**:
- A fully qualified class name has a namespace prefix.
- Example: `Acme\Namespace\SubNamespace\ClassName`.

2. **Base Directory Mapping**:
- Map the namespace prefix to a base directory.
- Example: Namespace prefix `Acme\Namespace\` maps to the base directory `/path/to/project/src/`.

3. **Class Files**:
- Each class must be in its own file.
- The file name must match the class name.
- Example: Class `SubNamespace\ClassName` in the namespace `Acme\Namespace` would be in the file `/path/to/project/src/SubNamespace/ClassName.php`.

4. **File Structure**:
- The directory structure in the base directory should follow the namespace structure.
- Example: For `Acme\Namespace\SubNamespace\ClassName`, the file structure would be `/path/to/project/src/SubNamespace/ClassName.php`.

5. **Autoloader Example**:
- An autoloader should be capable of loading the class file based on the namespace prefix and class name.
```php
spl_autoload_register(function ($class) {
$prefix = 'Acme\\Namespace\\';
$base_dir = __DIR__ . '/src/';
$len = strlen($prefix);
if (strncmp($prefix, $class, $len) !== 0) {
return;
}
$relative_class = substr($class, $len);
$file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';
if (file_exists($file)) {
require $file;
}
});
```

### Benefits

- **Interoperability**: Ensures that code from different sources can work together seamlessly.
- **Clarity**: Improves the clarity of the project structure by having a clear, standard way of organizing files.
- **Ease of Use**: Simplifies the autoloading process, making it easier to include classes automatically without manual includes.

By following PSR-4, PHP developers can ensure their code adheres to a standard structure, making it more maintainable and easier to integrate with other projects.

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