When you open your server as share host server (e.g webhost server) you have to make your server more secure than single account on single server.
As we know, today many hosting company using suPHP for their webserver. It more secure than other module. But suPHP has a weakness.. in standard configuration it make open_basedir not work properly, so a user can read file from other users.
And this condition used by hacker to read user file at same server when they hosted.
How to protect your users on suPHP environment?
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Mungkin hal ini sering sekali kita perlukan. Saya sendiri sering sekali membutuhkan ini ketika perlu merubah chmod atau permission sebuah webhost dengan kasus hanya perlu merubah pemission file atau directorynya saja.