Security-what should I do after the PHP page is illegally injected with eval (base64_decode )?

What if the PHP page is injected with eval (base64_decode) illegally? Also, how can this problem be injected and prevented?

What if the PHP page is injected with eval (base64_decode) illegally?
Also, how can this problem be injected and prevented?

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What if the PHP page is injected with eval (base64_decode) illegally?
Also, how can this problem be injected and prevented?

Has the file been rewritten by the uploaded Trojan?

1. Check and modify directory permissions

2. If eval is not used, add an eval to disable_functions in the disabled function list in php. ini. This should be the fastest temporary solution.

3. Check whether the upload function is vulnerable.