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Is there a way to use variables of some sort in an apache httpd.conf file? I'd like to define a value and use it throughout a block, as in
define myvar somename #or whatever the syntax would be alias /my/path "/some/path/${myvar} #or whatever the syntax would be 
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You can get environment variables substituted in to the config file at start up with the ${ENVVAR} syntax. It's up to you to figure out how to set those variables before starting up the server. Note that these variables will persist so any scripts in languages like php will be able to read them.
The most basic way to set an environment variable in Apache is using the unconditional SetEnv directive. Variables may also be passed from the environment of the shell which started the server using the PassEnv directive.
You can't edit httpd. conf. You'll need to make any changes necessary in an . htaccess file - you can override most stuff you'd need to override in here.
Apache is configured by placing configuration directives, such as Listen and ServerName , into a configuration file, which will be read by the Apache executable during the startup. The default configuration file is called " httpd. conf " (or " apache2.
Yes, kind of. You can get environment variables substituted in to the config file at start up with the ${ENVVAR} syntax. It's up to you to figure out how to set those variables before starting up the server.
http://httpd.apache.org/docs/2.2/configuring.html#syntax
Note that these variables will persist so any scripts in languages like php will be able to read them.
Also it's important to note that these values are interpreted once only when the server starts up so they're more like constants than variables.
As of httpd version 2.4, see this answer instead: https://stackoverflow.com/a/15731921/498798
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