PHP中的数字格式5.5到5.50

The field value is : 5.5 But I want to show like : 5.50

I tried

number_format($_REQUEST['price'], 2, '.', '');
round($_REQUEST['price'],2);

but all showing 5.5

That is because you are rounding the number after you format it.

You need to round it first (or during the format). This should work:

number_format(round($_REQUEST['price'], 2), 2, '.', '');