Its not really duplicating anyting in open_basedir. As a metter of fact it
is meant to be used together with open_basedir for best results.
ISP and people doin mass hosting would mainly benefit from that patch.
By using open_basedir in combination with cPanel (commercial hosting automation product) my company (an ISP) prevents users from reading files outside of their own /home directory.
Since cPanel is able to handle automagic deployment of open_basedir I would like to suggest to invest your time in creating an open source alternative to this closed source functionality, instead of reinventing open_basedir.
Regards,
Filip de Waard
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