How to find a code segment in multiple source code files?

There is a website with an invalid image link, and some more amazing characters. Now I want to find this code in php or database in multiple source code files and correct it. Is there a good way? There is a website with an invalid image link, and some more amazing characters.
Now I want to find this code in php or database in multiple source code files and correct it.
Is there a good way?

Reply content:

There is a website with an invalid image link, and some more amazing characters.
Now I want to find this code in php or database in multiple source code files and correct it.
Is there a good way?

For php code, what you need is not to "delete malicious code", but to incorporate the code into version management from the very beginning, in this way, when the website file is tampered with, it can be rolled back to the last deployment State at least.

Of course, considering the current situation of the subject, it is necessary to identify the tampering, so we need the help of powerful editors such as sublime text, notepad ++.

In addition, it is suggested that the best technique to find the files tampered with by the website is to screen the last modification time of the files ......

It is troublesome for databases. I'm afraid this is not a good solution except for screening or backup adjustment.

You can have a long snack...
Check the permissions. You are obviously under intrusion...

If you are searching for a key text in multiple files, you can use the following code on Linux or Mac:

grep -E "key_word" . -R --color=always -n

Content from here http://droidyue.com/blog/2014/05/15/quickly-find-content-in-files/

Sublime or NOTEPAD ++ CTRL + SHIFT + F

Git grep 'the character to be found '--' *. php'