Adding hreflang tags automatically in WordPress subdirectory multisite

Question

Adding hreflang tags automatically in WordPress subdirectory multisite

Steve

2022年5月12日 07:47

We have a WordPress MU subdirectory network setup:

www.example.com - main website, USA, global
www.example.com/uk/ - to display for UK visitors
www.example.com/au/ - to display for Australian visitors.

We want to add hreflang tags for each webpage and exclude the locations custom post type.

From this question, I've adjusted the code in the child theme's functions.php to:

function add_hreflang_attribute() {
   $site_url = network_site_url(); // base URL
   $alt_langs = array( 'au', 'uk' ); // two-letter language code
   $page_path = substr(get_permalink(), strlen(home_url('/'))); // path of page after base URL
   
   if (!( is_singular( 'locations' ) ) ) {
           
       // loop through the alternative languages, and get the appropriate hreflang tag for each that exists
       foreach ($alt_langs as $lang) {
           $updated_url_lang_path = $site_url . $lang . '/' . $page_path;
           $url_headers = @get_headers($updated_url_lang_path);
           if($url_headers  strpos( $url_headers[0], '200')) {
               if ($lang == 'uk') {
                   echo 'link rel=alternate href=' . $updated_url_lang_path . ' hreflang=en-gb /'. PHP_EOL;
               } elseif ($lang == '') {
                 
               }
               else {
                   echo 'link rel=alternate href=' . $updated_url_lang_path . ' hreflang=en-' . $lang . ' /'. PHP_EOL;
               }
           }
       }
       
       // set primary as x-default
       echo 'link rel=alternate href=' . $site_url . $page_path . ' hreflang=x-default /';
        
   }

}

This code works on the main website's home page example page: www.example.com/features/;

link rel=alternate href=https://www.example.com/au/features/ hreflang=en-au /
link rel=alternate href=https://www.example.com/uk/features/ hreflang=en-gb /
link rel=alternate href=https://www.example.com/features/ hreflang=x-default /

and it works for the:

AU site's home page,
the AU site's features page: https://www.example.com/au/features/,

but on www.example.com/uk/ it only produces:

link rel=alternate href=https://www.example.com/au/ hreflang=en-au /
link rel=alternate href=https://www.example.com/ hreflang=x-default /

It is missing:

link rel=alternate href=https://www.example.com/uk/ hreflang=en-gb /

The features page is a simple WordPress page.

Help appreciated.

Topic php multisite Wordpress

Category Web

birgire · Accepted Answer · 2022年5月12日 07:47

Alternatively we can set the hreflang as a site meta for each site:

update_site_meta( 1, 'hreflang', 'x-default' );
update_site_meta( 3, 'hreflang', 'en-au' );
update_site_meta( 5, 'hreflang', 'en-gb' );

and then for the hreflang attribute use;

get_site_meta( $site->blog_id, 'hreflang' )

and for the href attribute:

get_home_url( $site->blog_id, $page_path )

If we want to skip the site meta and use:

$hreflangs = array(
    1 => 'x-default',
    3 => 'en-au',
    5 => 'en-gb',
);

then the sites loop becomes:

$page_path = substr( get_permalink(), strlen( home_url('/') )); 

$sites = get_sites();
foreach ( $sites as $site ) {
    if ( isset( $hreflangs[ $site->blog_id ] ) ) {
        printf ( 
            '<link rel="alternate" href="%s" hreflang="%s" />'. PHP_EOL,
            esc_url( get_home_url( $site->blog_id, $page_path ) ),
            esc_attr( $hreflangs[ $site->blog_id ] )
        );
    }
}

One might further check if the page-path/slug exists on each site with e.g. get_page_by_path() or get_posts() via switch_to_blog().

Adding hreflang tags automatically in WordPress subdirectory multisite

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