php: nested if in select tag

nested if needs to be grouped to avoid unexpected error:
Ex:

//
//Parse error: parse error, unexpected ':'
$slect='<option value="1" '.$val== "1" ? 'selected="selected"' :''.'>slect1</option>';
//Work:
$slect='<option value="1" '.($val == "1" ? 'selected="selected"' :'').'>slect1</option>';

echo $var;

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