Pretty URL Conditional Rewrite - php

Question

Our site allows for a pretty url 'etest.me/1234' where '1234' is a client id. As you can see below it redirects to our route.php file where we do our redirect. The problem is when a client uses 'etest.me' without the '/1234' they get the apache 'The requested URL /go/ was not found on this server.' message. I would like the url to go to another page when the '/1234' is missing.
Note that we have the domain and path forwarded to the non-existing '/go' directory so the rules below will catch it. The following is in our .htaccess file in the root directory.
RewriteEngine On
#restrict rewriting URLs ONLY to paths that DO NOT exist
RewriteCond %{SCRIPT_FILENAME} !-d
# commented out to speed up looking since we are not processig file names anyway
#RewriteCond %{SCRIPT_FILENAME} !-f
RewriteRule ^go/([a-zA-Z0-9/]+)$ ./route\.php?go=$1

Answer 1

Working perfectly fine for me. Hope this will work for you as well.
RewriteEngine On
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteRule ^go/([a-zA-Z0-9]+)$ /route.php?go=$1 //when client id exist
RewriteRule ^([a-zA-Z0-9]+)$ /index.php // when no client id

Answer 2

You can add a new rule to handle this situation:
RewriteRule ^go/$ ./another_script\.php

Answer 3

I accepted the answer by Sahil and posted the entire logic below for others to use:
Domain: etest.me
Pretty URL: etest.me/1234 (where '1234' is a client id)
Forwarded to: etesting.io/go (with forward path option selected so the '/1234' will be include in the forward)
Note: There is no '/go' directory on the server, '/go' is used to trigger the redirect.
Wanted 'etest.me' (without client id) to go to index file in root directory.
Here is the rewrite rules in .htaccess:
RewriteEngine On
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteRule ^go/([a-zA-Z0-9/]*)$ ./route\.php?go=$1
Here is the route.php code:
<?php
if($_GET['go']){
$a = explode('/', $_GET['go']);
$c = count($a);
if($c == 1 || $c == 2){
header('location: ../../index.php?aid=' . $a[0] . '&tid=' . $a[1]);
exit;
}
else{
die('Invalid URL');
}
}
else{
header('location: ../index.php');
exit;
}
And finally the index.php file:
if($_GET['aid'] && $_GET['tid']){
header('location: test/register.php?aid=' . $_GET['aid'] . '&tid=' . $_GET['tid']);
exit;
}
elseif($_GET['aid']){
header('location: test/index.php?aid=' . $_GET['aid']);
exit;
}
else{
header('location: account/index.php?' . $_SERVER['QUERY_STRING']);
exit;
}
Hope this helps somebody in the future.
I would like a more elegant solution but it's behind me for now...