提交空白(包括所有空白)表单提交

如果我的网站上有问题,用户可以在空闲时发布空消息.

码:

if (isset($_POST['submit'])) {

  // check for empty fields
  if (empty($_POST['headline']) || empty($_POST['text']) ||
      empty($_POST['forum_id'])) {
      header("Refresh: 2; url=/add-thread"); 
      die('You must fill out every field.');
  }

// No errors? Save.
else {
$headline = mysql_real_escape_string($_POST['headline']);
$text = mysql_real_escape_string($_POST['text']);

mysql_query("INSERT INTO threads (headline, text, date, forum_id, user_id)
             VALUES ('$headline', '$text', NOW(), '$_POST[forum_id]', '$user[id]')");

header("Location: /thread/".mysql_insert_id()."");
}

}

我怎样才能解决这个问题？

trim()文字输入.你可以这样轻松地做到这一点:

// get input vars and trim space
$callback = array('filter' => FILTER_CALLBACK, 'options' => 'trim');
$fields = filter_input_array(INPUT_POST, array(
    'headline' => $callback,
    'text'     => $callback,
    'forum_id' => $callback,
));

// check for empty fields by counting how many are set
if ( count($fields) != count(array_filter($fields)) ) {
    // something was unset
}