I am trying to place a conditional on an 301 redirect htaccess file, it reads:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^old.domain.tld
RewriteRule ^(.*)$ https://new.domain.tld/?ref=abc$1

The issue is that some users that are being redirected already have values in the url, like:


upon redirect it comes out to be:


I want it to read the url, and if there are variables already, to just append &ref=abc, if there are no variable, to just append ?ref=abc

Please help me.

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> upon redirect it comes out to be:
> new.domain.tld/?ref=abc?firstname=john&lastname=doe
No it's not - You siply haven't tested

RewriteEngine on
RewriteCond %{HTTP_HOST} ^old.domain.tld
RewriteRule ^(.*)$ https://new.domain.tld/?ref=abc$1 [L,QSA]

with the above You'll get
old.domain.tld/?firstname=john&lastname=doe -> new.domain.tld/?ref=abc&firstname=john&lastname=doe
old.domain.tld/subpage.php?firstname=john&lastname=doe -> new.domain.tld/?ref=abcsubpage.php&firstname=john&lastname=doe
mind the "ref=abcsubpage.php"
[QSA] mean query string append

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