Hi @john.marcello
I would jump on google and see what you can find as possible solutions for URL strings and migration.
Because this is a simple text value, the issue is not 100% related to the ACF plugin, it is a common WP / Web issue.
On projects of my own, I would not allow my client to enter PHP into a string. This is simply asking for problems. Instead, I would allow them to enter a string url, or perhaps use a post_object field type to link to a post / page?
There is a great plugin called ‘Migrate DB Pro’ which will pull / push DB to another website and also do a string replace for urls!
Thanks
E
