Since this is my first time learning PHP, my level is still very poor. If you can get some advice from an expert, I would be very grateful!

The problem is like this. Our group is planning to build a book website. The front end can enter the book name for fuzzy search. The query code is like this. Query the title field from the books table. For example, I entered the field harry

$q1="SELECT * FROM books WHERE title like '%".$_POST['title']."%'";

After query Return all the results whose book titles contain harry. The code is as follows

The page returned by the query is as follows

I added a "modify" button after the query results. I want to jump to another page to modify the book information by clicking this button. The code executed after clicking the button is like this

But no matter which book I click on the modify button, the data of that book is not read after the page jumps

I want to ask Does anyone know where this went wrong?

If you do not use fuzzy query, for example, the code for searching books at the beginning is changed to this

$q1="SELECT * FROM books WHERE title ='".$title."'";

Enter the book title 1984

The query result is accurate

The page that jumps after clicking the modification also reads data

I am very confused as to why this happens