Why can't I complete the jump when I click to modify the page?

Question

Can anyone tell me why? edit.php has been written. And even if there is an error in edit.php, it should jump to the error page. Why do I refresh my page after clicking it, but it cannot jump.

Answer 1

Check if the path is correct, the writing should be fine

Answer 2

I think so, the outermost part should be double quotes

Answer 3

The problem with single quotes is that href='...' is a single quote, and there are also single quotes behind $val['id']