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I’ve gone through all the questions here related to open_basedir and could not find the answer to this question:
What is the use of open_basedir and how to make use of it ?
open_basedirlimits all I/O operations in userspace PHP to a certain configurable subset of the filesystem, in particular to a number of directories and their subdirectories,Its objective is mainly to avoid accidental modifications to parts of the filesystem. It can also be used to mitigate the effect of vulnerable PHP scripts on the filesystems. However, I wouldn’t rely too on it from a security perspective – almost all versions of PHP come with
open_basedirbypass bugs fixed (the problem being it must be manually enforced in a number of places in PHP’s source code).