A challenge about 404 [practice]

This is probably the case with a question about 404 [practice.

The website has been running for several years. dozens Of 404 pages are displayed.
How can I remove or change the code block linked to 404? [I cannot find it now]

Php + mysql
Smarty template engine

Help you guys.

The current method is to reproduce these pages and jump to the home page.

Reply to discussion (solution)

Url rewriting, fast and convenient

View the server log, ctrl + F 404

Chain disconnected?
Is there a tool?

Isn't the error 404 indicating that the page does not exist?

Does this mean that the 404 page is redirected to the home page?

Is there a tool?

Find du Niang "404 settings"

Http://jingyan.baidu.com/article/cb5d610556f7cc005c2fe0b5.html
There is a saying:
Do not redirect the 404 error to the website homepage. Otherwise, the homepage may disappear in the search engine.

Solve Nginx or Apache. it's much simpler ......

Yes, you cannot redirect the 404 page to the home page. The consequences are serious.