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

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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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