How to determine whether a single queue is selected

How do I determine if a single sequence is to be selected and read a value from the background database? how can I determine whether a single sequence is selected on the foreground interface? I have found some problems online.

Sample code

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In this case, it is wrong to solve the problem.

Reply to discussion (solution)

Checked = "checked"

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There is no error in writing
You can output your $ open file to see if it is 1.

There is no error in writing
You can output your $ open file to see if it is 1.


It is still possible to say something upstairs. First, check whether $ open is set to 1. it is reasonable to say that your writing method is correct.


I don't know whether your html and php are separated. if they are separated, you can judge the receipt of declared variables in the php program and call the variables on the page. if it is not separated, continue using your method.