A line from apache vhost setting

Server Config
1 
<VirtualHost *:80>
    php_admin_value open_basedir "/var/www/html/web/yourcharmstyle.com/htdocs/:/tmp/"

what the line meaning and do? thank you. why it add

/:/tmp/

? why it adds the line?

2

runeveryday,

You can review this particular basedir setting here.

3

if i add the line in the apache vhost setting, what’s the effection of it?

4

runeveryday,

The open_basedir function defines the locations or paths from which PHP is allowed to access files using functions like fopen() and gzopen(). If a file is outside of the paths defined by open_basdir, PHP will refuse to open it. In this case you can access files in both /var/www/html/web/yourcharmstyle.com/htdocs/ and /tmp/ with functions like fopen() and gzopen().