[Httpd Wiki] Update of "RewriteMap" by RichBowen

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The following page has been changed by RichBowen:
http://wiki.apache.org/httpd/RewriteMap

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   * RewriteMap prg:
   * RewriteMap dbd: or fastdbd:
  
+ For a description of the syntax, see [http://httpd.apache.org/trunk/mod/mod_rewrite.html#rewritemap Apache manual]
+ 
+ == Problem: ==
+ We want to map
+ {{{
+ www.example.com --> /home/www/htdocs/hosts/www/
+    the hostname www may be omitted from now on
+ www.sub1.example.com --> /home/www/htdocs/hosts/sub1/
+ www.sub2.sub1.example.com --> /home/www/htdocs/hosts/sub1/sub2/
+ www.sub3.sub2.sub1.example.com --> /home/www/htdocs/hosts/sub1/sub2/sub3/
+ etc.
+ }}}
+ == Recipe: ==
+ {{{
+ RewriteEngine on
+ RewriteMap sub /physical/path/to/rwmap.pl
+ RewriteLock  /var/lock/map.sub.lock
+ RewriteCond %{HTTP_HOST} ^(www\.)?([a-z.-]+)\.example\.com
+ RewriteRule ^/(.*) /home/www/htdocs/hosts/${sub:%2}$1 [L]
+ }}}
+ rwmap.pl:
+ {{{
+ #!/usr/bin/perl
+ 
+ $| = 1;
+ 
+ while(<STDIN>)
+ {
+ chomp($_);
+ my @lables = split(/\./);
+ @lables = reverse @lables;
+ foreach my $label (@lables) {
+ 	$path .= $label . "/";
+ 	}
+ print $path . "\n";
+ }
+ }}}
+