replace the unknown value using php

In my project am using some post, in that post i got a error in browser like this,"fourth ? one - hai" => i paste that error, but i cant get in, Its like a square between fourth and one... But i dont know that issue, and also i cant string replace that value, and i try to attach the screenshot, that also not working... And if u want to see that symbol please inspect the space between fourth and one... Help me..
 
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