filename

filename is the name of a text file that contains one name-value pair per line. filename can be an absolute path or a path relative to the server's config directory. Names and values are separated by white space. Lines beginning with # are ignored.

name

The name of the name-value pair for which the function looks in the text file. 

defaultvalue

The value returned by the function if filename exists but does not contain a name-value pair with a name matching the value of name. If defaultvalue is not specified, it defaults to an empty string.