<?php

namespace PopupBox\Publish;

defined( 'ABSPATH' ) || exit;

class Singleton {
	private static $instance;
	private array $value = [];

	private function __construct() {
	}

	public static function getInstance() {
		if ( null === static::$instance ) {
			static::$instance = new static();
		}

		return static::$instance;
	}

	public function setValue( $key, $value ) {
		$this->value[ $key ] = $value;
	}

	public function getValue(): array {
		return $this->value;
	}

	public function hasKey( $key ) : bool {
		return array_key_exists( $key, $this->value );
	}
}