What php script this shortener is using to redirect to another domain

https://boomx5.com/T7I86j I checked view page source but didn’t get anything that’s why i think it’s some kind of php script. here boomx5 is redirecting to other domain. on that domain there is some blue button with timer to continue that is not available in view page source. any idea ?

https://yourls.org/

Look here

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