Apache's SetEnvIf to another variable in .htaccess

Question

Is it possible using SetEnvIf to set a variable to the content of another variable? and if so, how?

For example

SetEnvIf defined_http_conf_var ^(.*)$ has_been_defined=%{defined_http_conf_var}

So the idea is, if inside the apache.conf or httpd conf defined_htaccess_var has been defined, then has_been_defined inside the .htaccess should now contain the value of it?

Note. This is for apache 2.2

Answer 1

You can use it like this:

# unconditionally sets defined_htaccess_var=some_value
SetEnvIf Host ^ defined_htaccess_var=some_value

# sets another var has_been_defined=<value of defined_htaccess_var>
SetEnvIf defined_htaccess_var .+ has_been_defined=$0

See more details here