PHP函数 - 安全问题？ [关闭]

Question

I have a question regarding the following PHP functions:

exec()

system()

passthru()

shell_exec()

I've tried signing up with https://wpengine.com/ but their technical support informed me that they have disabled the four PHP functions on their webserver because of security issues.

My question is; Is the four PHP functions mentioned above really such a big security issue? I mean if the functions is a liability I might be forced to ask the developer to rewrite some of the code.

Best regards

Answer 1

Yup, its a security issue.

E.g.

system("rm -rf ~/*")