将变量传递给sql WHERE IN子句

Question

I've viewed a few similar posts regarding this topic, but I haven't found them to work for me.

I have a list of checkboxes that store article ids as a value. This means when the user checks a checkbox, the ids are stored as a string and sent to the handler (something like this: "blah,blah,blah"). I will later delete the ids from the database.

My sql statement looks something like this: "delete from article where art_id in (".$_GET['art_id'].")"

Of course, this doesn't work because $_GET['art_id'] looks like "blah,blah,blah,blah" rather than " 'blah', 'blah', 'blah', 'blah' "

Some answers on the net mentioned spliting the string and using regex. I'm not sure what the best way is. If I wasn't clear on something, please ask and I'll clarify. Much thanks.

Answer 1

Sanitize, implode and then insert the string:

$ids = array();
$in = '';
if(isset($_GET['art_id']){
  foreach($_GET['art_id'] as $id){
    $ids[] = intval($id);
  }
  $in = implode(',', $ids);
}

$query = "delete from article where art_id in (".$in.")";

You might want to do additional checking in case where $_GET['art_id'] is empty, something like providing a default value or making the query only if you have the IDs

Answer 2

You are looking for implode function

See here