I just wrote a function and popped it in the functions.php on each site (if you’re using a separate child theme for each):
add_action('wp_head', 'arwd_hreflang_head');
function arwd_hreflang_head(){
global $post;
if(is_page()) {
$url = $_SERVER['REQUEST_URI'];
?>
<link rel="alternate" href="<?= 'https://domain.co.uk'.$url ?>" hreflang="en-gb" />
<link rel="alternate" href="<?= 'https://domain.com'.$url ?>" hreflang="en" />
<?php }
}
This adds it to the header on every page on the site. My two sites are exact copies of one another so there is always a matching page on the sister site.
Thread Starter
SRD75
(@srd75)
Thanks @arapps92
I can see your solution is simpler than ours. We use the same theme for all 3 sites, so we came up with:
function mm_add_hreflang_attribute() {
if (!( is_singular( 'locations' ) ) ) {
$sites = array(
array('', 'x-default'),
array('', 'en'),
array('en-gb/', 'en-gb'),
array('en-au/', 'en-au'),
);
if ( is_post_type_archive('locations') ) {
foreach ( $sites as $site ) {
$site_url = network_site_url();
$page_path = 'locations/';
$geo_url = $site[0];
$hreflang = $site[1];
$url = $site_url . $geo_url . $page_path;
echo '<link rel="alternate" href="' . $url . '" hreflang="' . $hreflang . '" />'. PHP_EOL;
}
} elseif ( is_archive() ) {
foreach ( $sites as $site ) {
$site_url = network_site_url();
$request = $GLOBALS['wp']->request;
$page_path = trim( preg_replace( '#^blog/topic/#', '', $request ), '/' );
$geo_url = $site[0];
$hreflang = $site[1];
$url = $site_url . $geo_url . 'blog/topic/' . $page_path . '/';
echo '<link rel="alternate" href="' . $url . '" hreflang="' . $hreflang . '" />'. PHP_EOL;
}
} else {
foreach ( $sites as $site ) {
$site_url = network_site_url();
$page_path = substr(get_permalink(), strlen(home_url('/')));
$geo_url = $site[0];
$hreflang = $site[1];
$url = $site_url . $geo_url . $page_path;
echo '<link rel="alternate" href="' . $url . '" hreflang="' . $hreflang . '" />'. PHP_EOL;
}
}
}
}
add_action( 'wp_head', 'mm_add_hreflang_attribute', 1 );
