open_basedir & php.ini

I know that open_basedir has been touched on more than once but my issue is that my ISP has changed open_basedir = \ is this the same as open_basedir=

Second point on php.ini is what are the differences between master values and local values when running a phpinfo (I have a good idea but never seen it documented)

Thanks for your time and replies

 

 

 

 

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