Noindex to query vars in WooCommerce

Noindex_to_query_vars_in_WooCommerce

// Send an X-Robots-Tag header early.
add_action( 'send_headers', function() {
    if ( is_admin() ) {
        return;
    }

    // If this is the WooCommerce “Shop” page, send noindex right away
    // If you need the shop page to be indexable, remove
    if ( function_exists( 'is_shop' ) && is_shop() ) {
        header( 'X-Robots-Tag: noindex, nofollow', true );
        return;
    }

    // List of exact query‐keys to catch. Add those you need.
    $exact_vars = array(
        'vendors',
        'woodmart_reviews_sorting_select',
        'query_type',
        'filter',
        'add-to-cart',
        'product_id',
        'orderby',
        'per_page',
        's', // standard search param
    );

    foreach ( $_GET as $key => $value ) {
        // If it's exactly in our list,
        // OR starts with "filter_",
        // OR starts with "query_type_"
        if (
            in_array( $key, $exact_vars, true )
            || 0 === strpos( $key, 'filter_' )
            || 0 === strpos( $key, 'query_type_' )
        ) {
            header( 'X-Robots-Tag: noindex, nofollow', true );
            break;
        }
    }
}, 0 ); // very early priority

// This is for RankMath. Adjust the code for Yoast, AIOSEO or other plugins
// Inject the HTML <meta name="robots" content="noindex, nofollow" /> via Rank Math

add_filter( 'rank_math/frontend/robots', function( $robots ) {
    if ( is_admin() ) {
        return $robots;
    }

    // If this is the WooCommerce “Shop” page, force noindex/no follow
    if ( function_exists( 'is_shop' ) && is_shop() ) {
        $robots['index']  = 'noindex';
        $robots['follow'] = 'nofollow';
        return $robots;
    }

    $exact_vars = array(
        'vendors',
        'woodmart_reviews_sorting_select',
        'query_type',
        'filter',
        'add-to-cart',
        'product_id',
        'orderby',
        'per_page',
        's', // standard search param
    );

    foreach ( $_GET as $key => $value ) {
        if (
            in_array( $key, $exact_vars, true )
            || 0 === strpos( $key, 'filter_' )
            || 0 === strpos( $key, 'query_type_' )
        ) {
            $robots['index']  = 'noindex';
            $robots['follow'] = 'nofollow';
            break;
        }
    }

    return $robots;
} );

// If you are using Filter Everything Pro, otherwise remove
// Override Filter Everything’s SEO robots meta with an array, not a string
add_filter( 'wpc_seo_robots', 'fe_force_noindex_query_vars', 20 );
function fe_force_noindex_query_vars( $robots ) {
    if ( is_admin() ) {
        return $robots;
    }

    $exact_vars = array(
        'vendors',
        'woodmart_reviews_sorting_select',
        'query_type',
        'filter',
        'add-to-cart',
        'product_id',
        'orderby',
        'per_page',
        's',
    );

    foreach ( $_GET as $key => $value ) {
        if (
            in_array( $key, $exact_vars, true )
            || 0 === strpos( $key, 'filter_' )
            || 0 === strpos( $key, 'query_type_' )
        ) {
            // **return an array** of directives
            return array( 'noindex', 'nofollow' );
        }
    }

    return $robots;
}