// Canonical URL + 防域名寄生
add_action('wp_head', function() {
echo '' . "\n";
}, 1);
add_action('template_redirect', function() {
$allowed_hosts = array(parse_url(home_url(), PHP_URL_HOST));
$www = 'www.' . $allowed_hosts[0];
$m = 'm.' . $allowed_hosts[0];
$allowed_hosts[] = $www;
$allowed_hosts[] = $m;
if (!empty($_SERVER['HTTP_HOST']) && !in_array($_SERVER['HTTP_HOST'], $allowed_hosts)) {
wp_redirect(home_url($_SERVER['REQUEST_URI']), 301);
exit;
}
});
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