// SEO-5: Add subdirectory sitemaps to robots.txt for better crawl discovery
function kyosei_robots_txt_sitemaps( $output, $public ) {
$subdirs = array(
"eto", "753", "houji", "shichifukujinn", "jikounoaisatsu",
"unlucky-year", "nihonn-shiro", "omiyamairi", "okuizome",
"osyougatu", "nennmatsu", "age-celebration", "star-festival",
"setsubunn", "hatsusekku", "hinamatsuri", "enngimono", "24sekki"
);
foreach ( $subdirs as $dir ) {
$sitemap_url = "https://www.kyosei-tairyu.jp/" . $dir . "/sitemap.xml";
if ( strpos( $output, $sitemap_url ) === false ) {
$output .= "Sitemap: " . $sitemap_url . "\n";
}
}
// Remove duplicate root sitemap entries
$lines = explode( "\n", $output );
$seen = array();
$clean = array();
foreach ( $lines as $line ) {
$trimmed = trim( $line );
if ( stripos( $trimmed, "sitemap:" ) === 0 ) {
if ( ! isset( $seen[$trimmed] ) ) {
$seen[$trimmed] = true;
$clean[] = $line;
}
} else {
$clean[] = $line;
}
}
return implode( "\n", $clean );
}
add_filter( "robots_txt", "kyosei_robots_txt_sitemaps", 100, 2 );
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