woocommerce/includes/libraries/action-scheduler/classes/ActionScheduler_Versions.php

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<?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 = $this->latest_version();
if ( empty($latest) || !isset($this->versions[$latest]) ) {
return '__return_null';
}
return $this->versions[$latest];
}
/**
* @return ActionScheduler_Versions
* @codeCoverageIgnore
*/
public static function instance() {
if ( empty(self::$instance) ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* @codeCoverageIgnore
*/
public static function initialize_latest_version() {
$self = self::instance();
call_user_func($self->latest_version_callback());
}
}