php - Insert multiple values in INT field -

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i got multiple check box drop down allows user select number of students wants add class. how add multiple student_id in student_class table? field have int instead of varchar because need auto increment. shows error when tried insert multiple value in it. below output need achieve.

thankyou

enter image description here

yes simple if student_id not auto_increment. try add multiple row's of student class student_id's same class_id's.


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