string(12) "免费实用"
string(0) ""
string(0) ""
string(0) ""
string(0) ""
array(2) {
  [0]=>
  int(2)
  [1]=>
  int(4)
}
免费实用select * from `software` where `relation_keyword` like ? and `software`.`delete_time` is null order by `id` desc