Aviso: Parâmetro 2 para Search_by_title () Previsto para ser uma referência, valor dado inwp-incluses classe-wp-hook.php na linha 287
#Custom theme (old themes that does not support the new PHP 7.1+ version)
#PHP 7.1 doesn’t like & in front of $query parameters in functions.
#In the Themes -> <your-theme> -> functions.php -> search the code and remove the &
__search_by_title_only( $search, $wp_query ) {
CodeAsian