如何将数组输入存储到数据库中？ MYSQL PHP表单输入foreach

In this project, I am making an attendance user interface for the teacher. Here teacher can update student's marks which will directly update into the MYSQL database. Below shows the code that I used to echo out the list of students from the database. Here, I have used array i.e. name="gradeEdit[]" in input section. In this project, I am making an attendance user