add_filter('the_content','your_delete_function');
function your_delete_function($content) {
return str_replace('?<p> </p>?', '', $content);
}
add_meta_box()
RewriteCond %{THE_REQUEST} " /\?"
RewriteRule ^ /? [R=301,L]
RewriteCond %{THE_REQUEST} " /\?"
RewriteRule ^ http://www.site.ru/? [R=301,L]