Parse error: syntax error, unexpected '?' – please help!

My site was working perfectly the other day, but now when it just says

Parse error: syntax error, unexpected ‘?’ in /home/juzz1983/public_html/pyxism-review.com/index.php on line 18

I googled the error and found another topic where someone had a similar error and he was actually hacked…

Im not sure what info i should give you but on that other topic they asked for his index.php code so I will just post that.

Please please help, i have no idea whats going on and very worried!

Thanks

The index.php is below
My website is https://pyxism-review.com

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