Drop down menu from another table and inject the choice

Good evening, I need help.
I have a lamp project. Book loan.
I created three tables. students books and loan.
I did something pretty simple.
A person enters the contact details of a student.
(Student_id, last name, first name).
the coordinates of slivres (book-id, title, author).

What I can’t do, choose a student from a drop-down menu in order to select my choice in the new table, as well as choose a book from a drop-down menu with the loan entry and exit dates.
I am working in php mysqli, in procedure mode.
Thanks in advance.

You would need to post your code and tell/show what symptom or error you are getting.

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