Isn't there null in the post form data? Why does foreach not report an error? ? ? ?

Question

I reported an error like this after executing it

Invalid argument supplied for foreach()

Answer 1

The following code has not been written yet. 0 0 You will know after writing the following if statement

Answer 2

I also encountered this problem. Did the original poster solve it?

Answer 3

It is necessary to make a judgment if it is empty