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language-locale-overwrite.php
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<?php
/*
* Plugin Name: Language Locale Overwrite
* Plugin URI: https://github.com/Swiss-Mac-User/language-locale-overwrite
* Description: This plugin allows overwriting the general Language Locale and on individual pages.
* Version: 2.4.0
* Requires at least: 6.5
* Requires PHP: 7.4
* Author: Swiss-Mac-User
* Author URI: https://github.com/Swiss-Mac-User/
*
* Text Domain: custom-language-locale
*/
/** Exit when file is opened in webbrowser */
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Add Plugin Settings to Database, editable in Admin area
*/
/* Runs when plugin is activated */
register_activation_hook( __FILE__, 'enable_language_locale_overwrite_plugin' );
function enable_language_locale_overwrite_plugin() {
add_option( 'custom_global_language_html_lang' );
add_option( 'custom_global_language_og_territory' );
}
/* Runs on plugin deactivation*/
register_deactivation_hook( __FILE__, 'disable_language_locale_overwrite_plugin' );
function disable_language_locale_overwrite_plugin() {
delete_option( 'custom_global_language_html_lang' );
delete_option( 'custom_global_language_og_territory' );
}
/**
* Mapping hooks to function filters
*/
if ( is_admin() ) {
/** Apply hooks only if logged-in User in the Backend */
add_action( 'admin_init', 'language_locale_overwrite_admin_settings' ); // Enhance General Settings
add_action( 'add_meta_boxes', 'add_custom_meta_boxes' ); // Enhance Posts/Pages
add_action( 'save_post', 'save_language_locale_overwrite' ); // Posts/Pages Save/Edit Action
add_action( 'category_add_form_fields', 'language_locale_overwrite_taxonomy_form_new'); // Enhance Categories
add_action( 'post_tag_add_form_fields', 'language_locale_overwrite_taxonomy_form_new'); // Enhance Tags
add_action( 'category_edit_form_fields', 'language_locale_overwrite_taxonomy_form_edit'); // Enhance Categories
add_action( 'post_tag_edit_form_fields', 'language_locale_overwrite_taxonomy_form_edit'); // Enhance Tags
add_action( 'created_term', 'language_locale_overwrite_taxonomy_form_save' ); // Categories+Tags Create Action
add_action( 'edited_terms', 'language_locale_overwrite_taxonomy_form_save' ); // Categories+Tags Edit Action
} else {
/** Apply hooks in the Frontend (all users / visitors) */
add_filter( 'language_attributes', 'set_custom_language_attributes' ); // <html lang>
add_action( 'wp_head', 'add_alternate_hreflang_metatags', 5); // <link rel="alternate" hreflang>
add_filter( 'the_title', 'markup_custom_language_content', 100 ); // Post/Page Title
add_filter( 'the_excerpt', 'markup_custom_language_content', 100 ); // Post/Page Excerpt
add_filter( 'the_content', 'markup_custom_language_content', 100 ); // Post/Page Content
add_filter( 'get_the_archive_title', 'markup_custom_language_taxonomy' ); // Archive Page Header
add_filter( 'get_the_archive_description', 'markup_custom_language_taxonomy' ); // Archive Page Header
}
/**
* Add Plugin specific Admin Settings
*/
function language_locale_overwrite_admin_settings() {
/** Add new Settings Section to "Settings » General" /wp-admin/options-general.php */
add_settings_section(
'llosettings'
,__( '<hr>WordPress Language Locale override', 'custom-language-locale' )
,'language_locale_overwrite_admin_section'
,'general'
);
$fieldargs = array(
'type' => 'string'
,'sanitize_callback' => 'sanitize_text_field'
,'default' => NULL
);
/** Add Settings Field «HTML lang override» to Plugin section */
register_setting( 'general', 'custom_global_language_html_lang', $fieldargs );
add_settings_field(
'llo_global'
,__( 'Change HTML lang attribute', 'custom-language-locale' )
,'language_locale_overwrite_admin_content_llo'
,'general'
,'llosettings'
,[
'id' => 'llo'
,'option_name' => 'custom_global_language_html_lang'
,'label_for' => 'llo_global'
]
);
/** Add Settings Field «og:local Territory» to Plugin section */
register_setting( 'general', 'custom_global_language_og_territory', $fieldargs );
add_settings_field(
'llo_ogc'
,__( 'Custom Country code', 'custom-language-locale' )
,'language_locale_overwrite_admin_content_ogt'
,'general'
,'llosettings'
,[
'id' => 'ogt'
,'option_name' => 'custom_global_language_og_territory'
,'label_for' => 'llo_ogc'
]
);
}
/**
* Settings Section-content for "Settings » General"
*/
function language_locale_overwrite_admin_section(){
_e( '<p class="description">Custom Language override for all Pages and Posts</p>', 'custom-language-locale' );
}
/**
* Settings Field for «HTML lang override»
*/
function language_locale_overwrite_admin_content_llo(){
?>
<input type="text" id="llo_global" name="custom_global_language_html_lang" maxlength="5"
value="<?php echo esc_attr( strtolower( get_option( 'custom_global_language_html_lang' ) ) ); ?>">
<p class="description">
<?php _e( 'Applied to all Posts/Pages (unless overwritten)', 'custom-language-locale' ); ?>
</p>
<?php }
/**
* Settings Field for «og:local Territory»
*/
function language_locale_overwrite_admin_content_ogt(){
?>
<input type="text" id="llo_ogc" name="custom_global_language_og_territory" maxlength="2"
value="<?php echo esc_attr( strtoupper( get_option( 'custom_global_language_og_territory' ) ) ); ?>">
<p class="description">
<?php _e( '2-char ISO Country Code used for og:locale', 'custom-language-locale' ); ?>
</p>
<?php }
/**
* Map custom Meta Box Section to functions for Posts and Pages
*
* @link https://wordpress.stackexchange.com/questions/106859/add-metabox-to-all-custom-post-types See Feature Request #3
*/
function add_custom_meta_boxes() {
add_meta_box( 'language-locale-overwrite', __( 'Language Locale', 'language_locale_overwrite' ), 'show_language_locale_meta_box' );//, ['post', 'page'] );
}
/**
* Render Meta Box content.
* @link https://metabox.io/how-to-create-custom-meta-boxes-custom-fields-in-wordpress/
* @param WP_Post $post The post object.
*/
function show_language_locale_meta_box( $post ) {
/** Get chached Views via get_post_meta from the database. */
wp_nonce_field( 'language_locale_meta_box_inner', 'language_locale_meta_box_inner_nonce' ); // Add an nonce field for save()
$global_locale_changed = get_global_custom_language_locale();
$custom_locale = get_post_meta( $post->ID, 'language_locale_overwrite', true );
$alternate_lang_post_ids = get_post_meta( $post->ID, 'alternate_lang_posts', true );
/** Display the meta box content. */
?>
<div id="llo" class="rwmb-field rwmb-text-wrapper">
<div class="rwmb-label">
<label for="language_locale_overwrite">Change Locale of this <?php echo ucfirst($post->post_type); ?></label>
</div>
<div class="rwmb-input">
<input type="text" class="rwmb-text" id="language_locale_overwrite" name="language_locale_overwrite" maxlength="5"
value="<?php echo esc_attr( $custom_locale ); ?>">
<p id="language_locale_overwrite_placeholder" class="description">
<?php echo ($global_locale_changed !== false ? 'Global <a href="'.get_admin_url( null, 'options-general.php#llo_global' ).'" title="'.__('Show WordPress Settings » General » Global Language Locale override', 'custom-language-locale').'" target="_blank">changed default</a>: <b>'.esc_attr($global_locale_changed).'</b> ' : '' ).'(WordPress default: '.get_bloginfo( 'language' ).')'; ?>
</p>
</div>
</div><?php
$find_all_custom_locales_used = get_all_custom_language_locales();
if ( !empty($find_all_custom_locales_used) && is_array($find_all_custom_locales_used) )
{
foreach( $find_all_custom_locales_used as $other_custom_locale ) {
/** Ignore empty & current Post/Page's locale (no alternate hreflang needed) */
if (!empty($other_custom_locale) && $other_custom_locale != $custom_locale)
{
$find_alternate_posts = get_posts_with_language_locale_overwrite( $post->post_type, $other_custom_locale );
if ( !empty($find_alternate_posts) ) { ?>
<div id="ahl-<?php echo esc_attr($other_custom_locale); ?>" class="rwmb-field rwmb-text-wrapper">
<div class="rwmb-label">
<label for="alternate_lang_post_<?php echo esc_attr($other_custom_locale); ?>">
Link alternate lang <?php echo ucfirst($post->post_type) . ': ' . esc_attr($other_custom_locale); ?>
</label>
</div>
<div class="rwmb-input">
<select class="rwmb-select" id="alternate_lang_post_<?php echo esc_attr($other_custom_locale); ?>" name="alternate_lang_posts[<?php echo esc_attr($other_custom_locale); ?>]">
<option value="">--- None selected ---</option>
<?php
foreach ($find_alternate_posts as $alternate_post) {
$selected = ( isset($alternate_lang_post_ids[$other_custom_locale]) && ($alternate_post->ID === $alternate_lang_post_ids[$other_custom_locale]) ? 'selected' : '' );
printf('<option value="%d" %s>%s</option>',
esc_attr( $alternate_post->ID )
,$selected
,esc_html( $alternate_post->post_title )
);
}
?>
</select>
<p class="description">
Select <?php echo ucfirst($post->post_type); ?> with <i>similar Content</i> but in locale: <b><?php echo esc_attr($other_custom_locale); ?></b>
</p>
</div>
</div>
<?php }
}
}
}
}
/**
* Get posts with language locale overwrite meta_key value.
*
* @link https://developer.wordpress.org/reference/functions/get_posts/
* @link https://developer.wordpress.org/reference/functions/get_pages/
*
* @since 2.4.0 Added support for Custom Post Types fixing [#3](https://github.com/Swiss-Mac-User/language-locale-overwrite/issues/3)
*
* @param string $type The type to filter for relevant matches: 'post' (Posts) or 'page' (Pages).
* @param string $locale The language locale.
* @return array|bool The array of matches with language locale overwrite - or false if no relevant results found.
*/
function get_posts_with_language_locale_overwrite( $type, $locale ) {
$args = [
'meta_key' => 'language_locale_overwrite'
,'meta_value' => $locale
,'posts_per_page' => -1 // All
,'orderby' => 'title'
,'order' => 'ASC'
];
$relevant_matches = false;
if ($type === 'post') // For POSTS, including custom post types
{
$args['post_type'] = get_post_types(['public' => true], 'names');
$relevant_matches = get_posts($args) ?: false;
}
elseif ($type === 'page') // For PAGES and any custom page-like types
{
$args['post_type'] = array_merge(['page'], get_post_types(['public' => true, 'hierarchical' => true], 'names'));
$relevant_matches = get_posts($args) ?: false;
}
return $relevant_matches;
}
/**
* Get all custom language locales.
*
* This function retrieves all the language locales that have been set
* as custom values for the 'language_locale_overwrite' meta key.
*
* @param bool $no_duplicates If true, filters out any duplicates. Default: true
* @return array An array of language locales.
*/
function get_all_custom_language_locales( $no_duplicates=true ) {
$defined_language_locales = array();
$list_of_custom_locales = array();
$query = new WP_Query([
'meta_key' => 'language_locale_overwrite'
,'meta_compare' => 'EXISTS'
,'fields' => 'ids'
]);
if ( $query->have_posts() )
{
foreach( $query->posts as $post_id ) {
$defined_language_locales[] = get_post_meta( $post_id, 'language_locale_overwrite', true );
}
$list_of_custom_locales = ( $no_duplicates ? array_unique($defined_language_locales) : $defined_language_locales);
return $list_of_custom_locales;
}
return $list_of_custom_locales;
}
/**
* Get WP language locale from settings.
*
* @return string The defined WP language locale.
*/
function get_default_wp_language_locale( ) {
return get_locale();
}
/**
* Get custom global locale if different to WP language locale.
* @uses get_default_wp_language_locale()
* @uses get_option('custom_global_language_html_lang')
* @return string|bool The custom global language locale, or false if WP default.
*/
function get_global_custom_language_locale( ) {
$overwritten_global_locale = false;
$custom_locale = get_option('custom_global_language_html_lang');
if ( !empty($custom_locale) && get_default_wp_language_locale() !== $custom_locale ) {
$overwritten_global_locale = $custom_locale;
}
return $overwritten_global_locale;
}
/**
* Save the meta when the post is saved.
*
* We need to verify this came from the our screen and with proper authorization,
* because save_post can be triggered at other times.
*
* @link https://metabox.io/how-to-create-custom-meta-boxes-custom-fields-in-wordpress/
*
* @since 2.2.0 Fixes PHP 8.1 log errors as in [#4](https://github.com/Swiss-Mac-User/language-locale-overwrite/issues/4)
*
* @param int $post_id The ID of the post being saved.
*/
function save_language_locale_overwrite( $post_id ) {
/** If this is an autosave, our form has not been submitted, so we don't want to do anything. */
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return $post_id;
if ( $parent_id = wp_is_post_revision( $post_id ) ) {
$post_id = $parent_id;
}
/** Check if our nonce is set. */
$nonce = filter_input(INPUT_POST, 'language_locale_meta_box_inner_nonce', FILTER_DEFAULT, FILTER_REQUIRE_SCALAR) ?? null;
if ( empty( $nonce ) ) return $post_id;
/** Verify that the nonce is valid. */
if ( ! wp_verify_nonce( $nonce, 'language_locale_meta_box_inner' ) ) return $post_id;
/** Check the user's permissions. */
$post_type = filter_input(INPUT_POST, 'post_type', FILTER_DEFAULT, FILTER_REQUIRE_SCALAR) ?? null;
if ( 'page' === $post_type ) {
if ( ! current_user_can( 'edit_page', $post_id ) ) return $post_id;
} else {
if ( ! current_user_can( 'edit_post', $post_id ) ) return $post_id;
}
/** Sanitize the user input. */
$meta_box_fieldvalue = sanitize_text_field( filter_input(INPUT_POST, 'language_locale_overwrite', FILTER_SANITIZE_SPECIAL_CHARS) ?? null );
$alternate_lang_posts = filter_input(INPUT_POST, 'alternate_lang_posts', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY) ?? [];
$alternate_lang_post_ids = [];
foreach ( $alternate_lang_posts as $alternate_lang => $alternate_post_id ) {
if ( ! empty($alternate_post_id) ) $alternate_lang_post_ids[$alternate_lang] = absint( $alternate_post_id );
}
/** Add the meta field values to the database. */
if ( ! empty($meta_box_fieldvalue) ) update_post_meta( $post_id, 'language_locale_overwrite', $meta_box_fieldvalue );
if ( ! empty($alternate_lang_post_ids) ) update_post_meta( $post_id, 'alternate_lang_posts', $alternate_lang_post_ids );
}
/**
* Custom Language Locale field for new Taxonomies (Categories and Tags)
*
* @link https://rudrastyh.com/wordpress/add-custom-fields-to-taxonomy-terms.html
*
* @since 2.3.0
*
* @param object $taxonomy The new taxonomy term, param is filled by WordPress.
*/
function language_locale_overwrite_taxonomy_form_new( $taxonomy ) {
$global_language_locale = get_global_custom_language_locale(); ?>
<div class="form-field">
<label for="llo_cat"><?php _e( 'Change HTML lang attribute', 'custom-language-locale' ); ?></label>
<input type="text" name="language_locale_overwrite" id="llo_cat" maxlength="5">
<p class="description"><?php _e( 'Use custom lang-attribute for the taxonomy page.', 'custom-language-locale' ); echo ($global_language_locale !== false ? __(' Default: ', 'custom-language-locale').'<a href="'.get_admin_url( null, 'options-general.php#llo_global' ).'" title="'.__('Show WordPress Settings » General » Global Language Locale override', 'custom-language-locale').'" target="_blank">'.$global_language_locale.'</a>' : ''); ?></p>
</div>
<?php }
/**
* Edit field for custom Language Locale in existing Taxonomies.
* @link https://rudrastyh.com/wordpress/add-custom-fields-to-taxonomy-terms.html
* @since 2.3.0
*
* @param object $term The edited taxonomy term, param is filled by WordPress.
*/
function language_locale_overwrite_taxonomy_form_edit( $term ) {
$global_language_locale = get_global_custom_language_locale();
$language_locale = get_term_meta( $term->term_id, 'language_locale_overwrite', true ) ?? null; ?>
<tr class="form-field">
<th><label for="llo_cat"><?php _e( 'Change HTML lang attribute', 'custom-language-locale' ); ?></label></th>
<td>
<input type="text" name="language_locale_overwrite" id="llo_cat" maxlength="5"
value="<?php if (!empty($language_locale)) echo esc_attr( $language_locale ); ?>">
<p class="description"><?php _e( 'Use custom lang-attribute for the taxonomy page.', 'custom-language-locale' ); echo ($global_language_locale !== false ? __(' Default: ', 'custom-language-locale').'<a href="'.get_admin_url( null, 'options-general.php#llo_global' ).'" title="'.__('Show WordPress Settings » General » Global Language Locale override', 'custom-language-locale').'" target="_blank">'.$global_language_locale.'</a>' : ''); ?></p>
</td>
</tr>
<?php }
/**
* Save custom Language Locale field when adding/updating a Taxonomy Term.
* @link https://developer.wordpress.org/reference/hooks/edited_taxonomy/
* @since 2.3.0
*
* @param integer $term_id The ID of a modified term, param is filled by WordPress.
*/
function language_locale_overwrite_taxonomy_form_save( $term_id ) {
$allowed_taxonomies = [ 'category', 'post_tag' ];
$taxonomy_type = filter_input(INPUT_POST, 'taxonomy', FILTER_DEFAULT, FILTER_REQUIRE_SCALAR) ?? null;
$custom_language_locale = sanitize_text_field( filter_input(INPUT_POST, 'language_locale_overwrite', FILTER_SANITIZE_SPECIAL_CHARS) ?? null );
if ( in_array($taxonomy_type, $allowed_taxonomies) && !empty($custom_language_locale) ) {
update_term_meta( $term_id, 'language_locale_overwrite', sanitize_text_field( $_POST[ 'language_locale_overwrite' ] ) );
}
}
/** =========================================
* RENDERING PAGE OUTPUT
*/
/**
* Modify get_bloginfo( 'language' ) to use 2-char ISO-Code.
*
* @link https://wordpress.stackexchange.com/a/210101/110615
* @uses get_global_custom_language_locale()
*/
function set_custom_language_attributes( $wp_default_lang )
{
/** Check if HTML Lang for single Post/Page differs from global locale */
$global_locale_changed = get_global_custom_language_locale();
$single_custom_locale = false;
if ( is_singular() && !empty( get_post_meta( get_the_ID(), 'language_locale_overwrite', true ) ) ) {
$single_custom_locale = esc_attr( get_post_meta( get_the_ID(), 'language_locale_overwrite', true ) );
}
$custom_locale = ( $single_custom_locale !== false ? $single_custom_locale : $global_locale_changed );
/** If applicable, apply the modified `lang="..."` HTML tag attribute */
$html_lang = ($custom_locale !== false ? 'lang="'.$custom_locale.'"' : $wp_default_lang);
return $html_lang;
}
/**
* Add required alternate hreflang Meta Tags to wp_head().
*
* @link https://www.tutorialexample.com/wordpress-add-html-meta-tag-in-header-wordpress-tutorial/
* @uses get_global_custom_language_locale(), get_default_wp_language_locale()
*/
function add_alternate_hreflang_metatags() {
if( is_singular() && !empty(get_the_ID()) ) {
$alternate_lang_posts = get_post_meta( get_the_ID(), 'alternate_lang_posts', true );
/** One or multiple Alternate Hreflang URLs found */
if ( !empty($alternate_lang_posts) ) {
/** Self-referencing Alternate Hreflang Metatag */
$global_locale = (get_global_custom_language_locale() !== false ? get_global_custom_language_locale() : get_default_wp_language_locale());
$alternate_hreflang_self = get_permalink( get_the_ID() );
$single_has_custom_locale = get_post_meta( get_the_ID(), 'language_locale_overwrite', true );
$alternate_locale_self = ( !empty($single_has_custom_locale) ? $single_has_custom_locale : $global_locale ); ?>
<link rel="alternate" hreflang="<?php echo esc_attr($alternate_locale_self); ?>" href="<?php echo esc_url($alternate_hreflang_self); ?>">
<?php
/** Alternate Hreflang Metatags to Posts/Pages in other Languages */
foreach ( $alternate_lang_posts as $alternate_locale => $linked_postid ) {
$alternate_hreflang = get_permalink( $linked_postid ); ?>
<link rel="alternate" hreflang="<?php echo esc_attr($alternate_locale); ?>" href="<?php echo esc_url($alternate_hreflang); ?>">
<?php }
}
}
}
/**
* Attribute the_title(), the_excerpt(), and the_content() of Post title and summaries (on Archive pages)
*
* @since 2.3.0
*
* @uses get_global_custom_language_locale(), is_singular(), is_archive(), get_the_ID(), get_post_meta()
* @param string $content The content (title, excerpt, or body) to modify, param is filled by WordPress.
* @return string Modified $content
*/
function markup_custom_language_content( $content ) {
$modified_content = $content;
$global_locale = get_global_custom_language_locale();
if ( !is_singular() && is_archive() ) {
if ( !empty(get_the_ID()) ) {
$post_custom_locale = esc_attr( get_post_meta( get_the_ID(), 'language_locale_overwrite', true ) );
if ( !empty($post_custom_locale) && $global_locale !== false && $post_custom_locale !== $global_locale ) {
/** Prepends and appends the $content */
$modified_content = sprintf('<div lang="%s">%s</div>', $post_custom_locale, $content);
}
}
}
return $modified_content;
}
/**
* Attribute single_cat_title(), single_tag_title(), and the_archive_description() of Taxonomy pages
*
* @since 2.3.0
*
* @uses get_global_custom_language_locale(), is_category(), is_tag(), get_queried_object_id(), get_term_meta()
* @param string $content The content (title or description) to modify, param is filled by WordPress.
* @return string Modified $content
*/
function markup_custom_language_taxonomy( $content ) {
$modified_content = $content;
$global_locale = get_global_custom_language_locale();
if ( is_category() || is_tag() ) {
$taxonomy_id = get_queried_object_id();
$taxonomy_custom_locale = null;
if ( $taxonomy_id > 0 ) {
$taxonomy_custom_locale = esc_attr( get_term_meta( $taxonomy_id, 'language_locale_overwrite', true ) ) ?? null;
if ( !empty($taxonomy_custom_locale) && $global_locale !== false && $taxonomy_custom_locale !== $global_locale ) {
/** Prepends and appends the $content */
$modified_content = sprintf('<span lang="%s">%s</div>', $taxonomy_custom_locale, $content);
}
}
}
return $modified_content;
}
/** =========================================
* COMPATIBILITY WITH OTHER WORDPRESS PLUGINS
*/
/**
* Plugin dependency: OG — Better Share on Social Media
*
* User custom locale (language code) properly as "og:local" tag.
* @link https://wordpress.org/plugins/og/
* @link https://github.com/gohugoio/hugo/issues/8296
* @uses og_get_locale(), get_global_custom_language_locale()
* @uses get_option('custom_global_language_og_territory')
*/
if ( ! function_exists( 'og_get_locale' ) ) {
add_filter('og_get_locale', 'og_plugin_language_locale_overwrite');
function og_plugin_language_locale_overwrite( $locale ) {
global $post;
$global_locale_changed = get_global_custom_language_locale();
$page_locale_changed = get_post_meta( $post->ID, 'language_locale_overwrite', true );
$custom_locale = ( !empty($page_locale_changed) ? $page_locale_changed : ( $global_locale_changed !== false ? $global_locale_changed : $locale ) );
$custom_og_countrycode = get_option('custom_global_language_og_territory');
/** Ensure og:locale format is "language_TERRITORY" */
if (strpos($custom_locale, '-') !== false || strpos($custom_locale, '_') !== false) {
$og_locale = str_replace('-', '_', $custom_locale);
}
/** Assumes anything else, that is not like "ll_CC", is only "ll" (and hence a custom override) */
elseif (!empty($custom_og_countrycode)) {
$og_locale = sprintf('%s_%s', strtolower($custom_locale), strtoupper($custom_og_countrycode));
}
/** Use default as fallback, if no custom og:locale can be mapped */
else {
$og_locale = $locale;
}
return $og_locale;
}
}