抱歉，如果这是一个小错误。我用的是第一次多重查询。错误1和错误2除了在错误2插入行中添加了一个冒号（“”）之外，这两个代码都是相同的。如果我从for循环内部回音，就会显示一切正常。一段时间成功但没有插入数据库。先谢谢你。
错误1：错误：您的sql语法有错误；请查看与您的mysql服务器版本对应的手册，以便在第1行的“insert into student\u attention（attention\u date，attention\u class\u id，attention）”附近使用正确的语法

include("../includes/db.php");

if(!empty($_POST)) {

  $student_attendance_id            =   $_POST['student_attendance_id'];
  $attendance_date                  =   $_POST['attendance_date'];
  $attendance_class_id              =   $_POST['attendance_class_id'];
  $attendance_section_id            =   $_POST['attendance_section_id'];
  $attendance_student_id            =   $_POST['attendance_student_id'];
  if(isset($_POST['attendance_present_absent'])){
    $attendance_present_absent = $_POST['attendance_present_absent'];
  } else {
    $attendance_present_absent        =  '';
  }

$query = '';

         for($count = 0; $count<count($attendance_student_id); $count++)
    {

      $attendance_date_now              = mysqli_real_escape_string($connection, $attendance_date);
      $student_attendance_id_now        = mysqli_real_escape_string($connection, $student_attendance_id[$count]);
      $attendance_class_id_now          = mysqli_real_escape_string($connection, $attendance_class_id[$count]);
      $attendance_section_id_now        = mysqli_real_escape_string($connection, $attendance_section_id[$count]);
      $attendance_student_id_now        = mysqli_real_escape_string($connection, $attendance_student_id[$count]);
      $attendance_present_absent_now    = mysqli_real_escape_string($connection, $attendance_present_absent[$count]);

      $query .= "INSERT INTO student_attendance (attendance_date, attendance_class_id, attendance_section_id, attendance_student_id, attendance_present_absent ) ";
      $query .= "VALUES ('{$attendance_date_now}', '{$attendance_class_id_now}', '{$attendance_section_id_now}', '{$attendance_student_id_now}', '{$attendance_present_absent_now}' ) ";

      echo $attendance_date_now;
      echo $attendance_class_id_now . $attendance_section_id_now . "<br>";

    }
$result = mysqli_multi_query($connection, $query) or die("Error :" . mysqli_error($connection));

错误2：您的sql语法有错误；检查与mysql服务器版本相对应的手册，在第1行的“出勤日期”、“出勤班级id”、“出勤部门id”、“出勤s”附近使用正确的语法

include("../includes/db.php");

if(!empty($_POST)) {

  $student_attendance_id            =   $_POST['student_attendance_id'];
  $attendance_date                  =   $_POST['attendance_date'];
  $attendance_class_id              =   $_POST['attendance_class_id'];
  $attendance_section_id            =   $_POST['attendance_section_id'];
  $attendance_student_id            =   $_POST['attendance_student_id'];
  if(isset($_POST['attendance_present_absent'])){
    $attendance_present_absent = $_POST['attendance_present_absent'];
  } else {
    $attendance_present_absent        =  '';
  }

  for($count = 0; $count<count($attendance_student_id); $count++)
{

  $attendance_date_now              = mysqli_real_escape_string($connection, $attendance_date);
  $student_attendance_id_now        = mysqli_real_escape_string($connection, $student_attendance_id[$count]);
  $attendance_class_id_now          = mysqli_real_escape_string($connection, $attendance_class_id[$count]);
  $attendance_section_id_now        = mysqli_real_escape_string($connection, $attendance_section_id[$count]);
  $attendance_student_id_now        = mysqli_real_escape_string($connection, $attendance_student_id[$count]);
  $attendance_present_absent_now    = mysqli_real_escape_string($connection, $attendance_present_absent[$count]);

  $query .= "INSERT INTO student_attendance ('attendance_date', 'attendance_class_id', 'attendance_section_id', 'attendance_student_id', 'attendance_present_absent' ) ";
  $query .= "VALUES ('{$attendance_date_now}', '{$attendance_class_id_now}', '{$attendance_section_id_now}', '{$attendance_student_id_now}', '{$attendance_present_absent_now}' ) ";

  echo $attendance_date_now;
  echo $attendance_class_id_now . $attendance_section_id_now . "<br>";

}

$result = mysqli_multi_query($connection, $query) or die("Error :" . mysqli_error($connection));