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function is not described

wp_dropdown_languages() WP 4.0.0

Language selector.

  • See: get_available_languages()
  • See: wp_get_available_translations()
  • Since 4.3.0 Introduced the echo argument.
  • Since 4.7.0 Introduced the show_option_site_default argument.

No Hooks.

Return

String. HTML content

Usage

wp_dropdown_languages( $args );
$args(string/array)

Array or string of arguments for outputting the language selector.

  • $id (string)
    ID attribute of the select element.
    Default: 'locale'

  • $name (string)
    Name attribute of the select element.
    Default: 'locale'

  • $languages (array)
    List of installed languages, contain only the locales.
    Default: empty array

  • $translations (array)
    List of available translations.
    Default: result of wp_get_available_translations()

  • $selected (string)
    Language which should be selected.
    Default: ''

  • $echo (true/false/int)
    Whether to echo the generated markup. Accepts 0, 1, or their boolean equivalents.
    Default: 1

  • $show_available_translations (true/false)
    Whether to show available translations.
    Default: true

  • $show_option_site_default (true/false)
    Whether to show an option to fall back to the site's locale.
    Default: false

Default: array()

Code of wp dropdown languages: wp-includes/l10n.php VER 5.0.3

<?php
function wp_dropdown_languages( $args = array() ) {

	$parsed_args = wp_parse_args( $args, array(
		'id'           => 'locale',
		'name'         => 'locale',
		'languages'    => array(),
		'translations' => array(),
		'selected'     => '',
		'echo'         => 1,
		'show_available_translations' => true,
		'show_option_site_default'    => false,
	) );

	// Bail if no ID or no name.
	if ( ! $parsed_args['id'] || ! $parsed_args['name'] ) {
		return;
	}

	// English (United States) uses an empty string for the value attribute.
	if ( 'en_US' === $parsed_args['selected'] ) {
		$parsed_args['selected'] = '';
	}

	$translations = $parsed_args['translations'];
	if ( empty( $translations ) ) {
		require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
		$translations = wp_get_available_translations();
	}

	/*
	 * $parsed_args['languages'] should only contain the locales. Find the locale in
	 * $translations to get the native name. Fall back to locale.
	 */
	$languages = array();
	foreach ( $parsed_args['languages'] as $locale ) {
		if ( isset( $translations[ $locale ] ) ) {
			$translation = $translations[ $locale ];
			$languages[] = array(
				'language'    => $translation['language'],
				'native_name' => $translation['native_name'],
				'lang'        => current( $translation['iso'] ),
			);

			// Remove installed language from available translations.
			unset( $translations[ $locale ] );
		} else {
			$languages[] = array(
				'language'    => $locale,
				'native_name' => $locale,
				'lang'        => '',
			);
		}
	}

	$translations_available = ( ! empty( $translations ) && $parsed_args['show_available_translations'] );

	// Holds the HTML markup.
	$structure = array();

	// List installed languages.
	if ( $translations_available ) {
		$structure[] = '<optgroup label="' . esc_attr_x( 'Installed', 'translations' ) . '">';
	}

	// Site default.
	if ( $parsed_args['show_option_site_default'] ) {
		$structure[] = sprintf(
			'<option value="site-default" data-installed="1"%s>%s</option>',
			selected( 'site-default', $parsed_args['selected'], false ),
			_x( 'Site Default', 'default site language' )
		);
	}

	// Always show English.
	$structure[] = sprintf(
		'<option value="" lang="en" data-installed="1"%s>English (United States)</option>',
		selected( '', $parsed_args['selected'], false )
	);

	// List installed languages.
	foreach ( $languages as $language ) {
		$structure[] = sprintf(
			'<option value="%s" lang="%s"%s data-installed="1">%s</option>',
			esc_attr( $language['language'] ),
			esc_attr( $language['lang'] ),
			selected( $language['language'], $parsed_args['selected'], false ),
			esc_html( $language['native_name'] )
		);
	}
	if ( $translations_available ) {
		$structure[] = '</optgroup>';
	}

	// List available translations.
	if ( $translations_available ) {
		$structure[] = '<optgroup label="' . esc_attr_x( 'Available', 'translations' ) . '">';
		foreach ( $translations as $translation ) {
			$structure[] = sprintf(
				'<option value="%s" lang="%s"%s>%s</option>',
				esc_attr( $translation['language'] ),
				esc_attr( current( $translation['iso'] ) ),
				selected( $translation['language'], $parsed_args['selected'], false ),
				esc_html( $translation['native_name'] )
			);
		}
		$structure[] = '</optgroup>';
	}

	// Combine the output string.
	$output  = sprintf( '<select name="%s" id="%s">', esc_attr( $parsed_args['name'] ), esc_attr( $parsed_args['id'] ) );
	$output .= join( "\n", $structure );
	$output .= '</select>';

	if ( $parsed_args['echo'] ) {
		echo $output;
	}

	return $output;
}