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<?php interface Element { /** * Constructor function. Must pass existing config, or leave as * is for new element, where the default will be used instead. * * @param array $config Element configuration. */ public function __construct( $config = [] ); /** * Get the definition of the Element. * * @return array An array with 'title', 'description' and 'type' */ public static function get_definition(); /** * Get Element config variable. * * @return array Associative array of Element Config. */ public function get_config(); /** * Set Element config variable. * * @param array $config New configuration variable. * * @return void */ public function set_config( $config ); } abstract class Base implements Element { /** * Element configuration variable * * @var array */ protected $config = []; /** * Get Element config variable. * * @return array Associative array of Element Config. */ public function get_config() { return $this->config; } /** * Create an eForm Element instance * * @param array $config Element config. */ public function __construct( $config = [] ) { $this->set_config( $config ); } } class MyElement extends Base { public static function get_definition() { return [ 'type' => 'MyElement', ]; } public function set_config( $config ) { // Do something here $this->config = $config; } } $element = new MyElement( [ 'foo' => 'bar', ] ); print_r( $element->get_config() );