Description:
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My first question, What happened to the 'Hey'?
My second question, Why are variables/strings not working?

Please tell me how I can fix this as.

+I don't know my php version. When I had my last site though, the strings were working.

Reproduce code:
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<?php
$string = "Hey<br>";
echo $string;
echo "end output.";
?>

Expected result:
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Hey
end output.

Actual result:
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end output.