if ('2') { $prev = 'http://'.$_SERVER['HTTP_HOST'].'/search/porn/2'; } ?> if ('2' == '1') { $prev = 'http://'.$_SERVER['HTTP_HOST'].'/search/porn/1'; } ?> if ('4' && '4' <= 10) { $next = 'http://'.$_SERVER['HTTP_HOST'].'/search/porn/4'; } ?>