Question

我正在努力制作一个家庭作业计划员，而我却无法查询班级ID和家庭作业ID来过滤数据库，以便向学生展示他们自己的作业。我试图使用for循环过滤掉那些不适合用户的作业，但我一直在

注意：未定义的偏移量：在第109行的C：\ home \ site \ wwwroot \ calendar.php中为0

这是什么意思，是否有更好的方法来解决这个问题？

  $user_id = $_SESSION['user_id'];
  $link = mysqli_connect('mysql3.gear.host','baldwin','Baldwin1#','userinfo');
  $query = mysqli_query($link, "SELECT * FROM events;") or die(mysql_error());
  $query_classid = mysqli_query($link, "SELECT * FROM student_class WHERE user_id = $user_id;") or die(mysql_error());

  $events = array();
  $classID = array();
  $eventID = array();


  while($row = mysqli_fetch_assoc($query_classid)){

   $classID[$row['class_id']][] = $row;
 }

 for($i = 0, $size = count($classID); $i < $size; ++$i){

 $class_search = intval($classID[$i]);

print_r($class_search);
$query_class_event = mysqli_query($link, "SELECT * FROM student_events WHERE class_id = $class_search;") or die(mysql_error());

while($row = mysqli_fetch_assoc($query_class_event)){

    $eventID[$row['event_id']][] = $row;
}
}

for($i = 0, $size = count($eventID); $i < $size; ++$i){

$event_search = intval($eventID[$i]);
$query_eventid = mysqli($link, "SELECT * FROM events WHERE event_id = '$event_search';") or die(msql_error());

while($row = mysqli_fetch_assoc($query_eventid)){

        $events[$row['duedate']][] = $row;

    }
 }

注意：未定义的偏移量：0

0 个答案: