无论区域设置如何,如何将浮点数转换为字符串？

float_num = 123.456
str_num = str(float_num)

double floatNum = 123.456;
String strNum = Double.toString(floatNum);

let floatNum = 123.456;
let strNum = floatNum.toString();

double floatNum = 123.456;
string strNum = floatNum.ToString();

$floatNum = 123.456;
$strNum = (string)$floatNum;