name : walker-dropdown.php <?php /** * Displays languages in a dropdown list * * @since 1.2 */ class PLL_Walker_Dropdown extends Walker { public $db_fields = array( 'parent' => 'parent', 'id' => 'id' ); /** * Outputs one element * * @since 1.2 * * @param string $output Passed by reference. Used to append additional content. * @param object $element The data object. * @param int $depth Depth of the item. * @param array $args An array of additional arguments. * @param int $current_object_id ID of the current item. */ public function start_el( &$output, $element, $depth = 0, $args = array(), $current_object_id = 0 ) { $value = $args['value']; $output .= sprintf( "\t" . '<option value="%1$s"%2$s%3$s>%4$s</option>' . "\n", esc_attr( $element->$value ), method_exists( $element, 'get_locale' ) ? sprintf( ' lang="%s"', esc_attr( $element->get_locale( 'display' ) ) ) : '', selected( isset( $args['selected'] ) && $args['selected'] === $element->$value, true, false ), esc_html( $element->name ) ); } /** * Overrides Walker::display_element as expects an object with a parent property * * @since 1.2 * * @param object $element Data object. * @param array $children_elements List of elements to continue traversing. * @param int $max_depth Max depth to traverse. * @param int $depth Depth of current element. * @param array $args An array of arguments. * @param string $output Passed by reference. Used to append additional content. */ public function display_element( $element, &$children_elements, $max_depth, $depth = 0, $args, &$output ) { $element = (object) $element; // Make sure we have an object $element->parent = $element->id = 0; // Don't care about this parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output ); } /** * Starts the output of the dropdown list * * @since 1.2 * * List of parameters accepted in $args: * * flag => display the selected language flag in front of the dropdown if set to 1, defaults to 0 * value => the language field to use as value attribute, defaults to 'slug' * selected => the selected value, mandatory * name => the select name attribute, defaults to 'lang_choice' * id => the select id attribute, defaults to $args['name'] * class => the class attribute * disabled => disables the dropdown if set to 1 * * @param array $elements elements to display * @param array $args * @return string */ public function walk( $elements, $args = array() ) { $output = ''; $args = wp_parse_args( $args, array( 'value' => 'slug', 'name' => 'lang_choice' ) ); if ( ! empty( $args['flag'] ) ) { $current = wp_list_filter( $elements, array( $args['value'] => $args['selected'] ) ); $lang = reset( $current ); $output = sprintf( '<span class="pll-select-flag">%s</span>', empty( $lang->flag ) ? esc_html( $lang->slug ) : $lang->flag ); } $output .= sprintf( '<select name="%1$s"%2$s%3$s%4$s>' . "\n" . '%5$s' . "\n" . '</select>' . "\n", $name = esc_attr( $args['name'] ), isset( $args['id'] ) && ! $args['id'] ? '' : ' id="' . ( empty( $args['id'] ) ? $name : esc_attr( $args['id'] ) ) . '"', empty( $args['class'] ) ? '' : ' class="' . esc_attr( $args['class'] ) . '"', disabled( empty( $args['disabled'] ), false, false ), parent::walk( $elements, -1, $args ) ); return $output; } }