get_installed_version(); if ( ! $force && $this->get_db_version() <= $installed_version ) { return; } $migrations = new Collection( $this->get_migrations() ); if ( ! $force ) { $migrations = $migrations->filter( function ( $_, $version ) use ( $installed_version ) { return $version > $installed_version; } ); } $migrations->map( function ( Base_Migration $migration, $version ) { $migration->up(); $this->update_db_version_option( $version ); } ); $this->update_db_version_option( $this->get_db_version() ); } public function register() { add_action( 'admin_init', function () { $this->up(); } ); } protected function update_db_version_option( $version ) { update_option( $this->get_db_version_option_name(), $version ); } protected function get_installed_version() { return intval( get_option( $this->get_db_version_option_name() ) ); } abstract protected function get_db_version(); abstract protected function get_db_version_option_name(): string; abstract protected function get_migrations(): array; }