<?php
enum Hook: string {
    case CONTEXT_READY = 'context_ready';
    case PROCESS_CONTENT = 'process_content';
    case TEMPLATE_VARS = 'template_vars';
}

class Hooks {
    private static array $filters = [];
    
    public static function add(Hook $hook, callable $callback): void {
        self::$filters[$hook->value][] = $callback;
    }
    
    public static function apply(Hook $hook, mixed $value, mixed ...$args): mixed {
        if (!isset(self::$filters[$hook->value])) return $value;
        
        foreach (self::$filters[$hook->value] as $filter) {
            $value = $filter($value, ...$args);
        }
        
        return $value;
    }
}