Insert code into the file

[Rehtt]

It is recommended to add the function: add the following code in the file, such as inserting the code after the jpg file, so that you can bypass some restrictions on detecting file types to achieve the purpose of intrusion

[epinna]

It supported something similar in the past but I removed it cause I don't want to support the different way of hiding PHP in other file format. The user can do it manually as needed.