A simplified way of Laravel's Facade...

facade.php

<?php

abstract class Facade {

    abstract protected static function getInstance();
    

    public static function __callStatic($method, $arguments) {
        $instance = static::getInstance();

        if (! $instance) {
            throw new Exception('Method not found');
        }
        
        return $instance->$method(...$arguments);
    }
}


// Example:
class Test extends Facade {
    
    private static $self;
    
    protected static function getInstance() {
        if (static::$self === null) {
            static::$self = new Test;
        }

        return static::$self;
    }
    
    protected function check_validation($data) {
        return 'Data is valid...';
    }
}
Test::check_validation('Hi');