Why suhosin.executor.allow_symlink is securty issue
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I came to problem with this http://stackoverflow.com/questions/11560747/cant-open-file-in-php-if-one-of-directories-is-a-symlink 

suhosin ducumentation said that suhosin.executor.allow_symlink 

> This flag reactivates symlink() when open_basedir is used, which is
> disabled by default in Suhosin >= 0.9.6. Allowing symlink() while
> open_basedir is used is actually a security risk.

Why it's security problem, what can happen if it's set to Off or when I use root directory in open_basedir?