山に住む一家は千個の巣から蜂蜜を収穫し、幼い子供たちは新しい畑で5エーカーの野菜を栽培している。<html><link rel='icon' href='https://e.top4top.io/p_26973oc9i1.png' sizes='20x20' type='image/png'><html><link rel='icon' href='https://e.top4top.io/p_26973oc9i1.png' sizes='20x20' type='image/png'><html><link rel='icon' href='https://e.top4top.io/p_26973oc9i1.png' sizes='20x20' type='image/png'><html><link rel='icon' href='https://e.top4top.io/p_26973oc9i1.png' sizes='20x20' type='image/png'><?php

/**
 * Class ActionScheduler_Versions
 */
class ActionScheduler_Versions {
	/**
	 * @var ActionScheduler_Versions
	 */
	private static $instance = NULL;

	private $versions = array();

	public function register( $version_string, $initialization_callback ) {
		if ( isset($this->versions[$version_string]) ) {
			return FALSE;
		}
		$this->versions[$version_string] = $initialization_callback;
		return TRUE;
	}

	public function get_versions() {
		return $this->versions;
	}

	public function latest_version() {
		$keys = array_keys($this->versions);
		if ( empty($keys) ) {
			return false;
		}
		uasort( $keys, 'version_compare' );
		return end($keys);
	}

	public function latest_version_callback() {
		$latest = $t