Curly bracket in string detected as error

Hi,

I'm keep seeing <expression> expected error-message under the right curly bracket ( } ) in the following example string. It is not string specific, you can see this error-message as soon as you put a pair of curly bracket in a string.

$sql = 'SELECT * FROM table WHERE id<>{id} AND another={another} LIMIT 1';

Would you mind to advise me or fix it?

Thanks!