Code-Snippets-Functions/Execute a function on a child site/Relevanssi/boosting-shorter-posts-with-higher-keyword-density.txt

add_filter( 'relevanssi_match', 'rlv_inverse_document_length', 10, 2 );
function rlv_inverse_document_length( $match, $idf ) {
    $current_post_object = get_post( $match->doc );
    $minimum_doc_length  = 5000; // in characters
    if ( ! $current_post_object ) {
        $idl = 1;
    } else {
        $post_length = max( $minimum_doc_length, strlen( $current_post_object->post_content ) );
        $idl         = $minimum_doc_length / $post_length;
    }
    $match_multiplier = $match->weight / ( $match->tf * $idf );
    $match->weight    = $match_multiplier * $match->tf * $idf * $idl;
    return $match;
}