在php中使用double / float [重复]

Question

Possible Duplicate:
PHP: show a number to 2 decimal places

$b = $del['Antal'];
$y = $info['Pris'];
$z = $y * $b;

$y comes from a mysql database where its type is "double(10,2)" so that one works when I try echo $y; it responds with two decimals.

But now I would like to multiply it with $b.

For example 10.20 * 2 = 20.40

But right now it is like: 10.20 * 2 = 20.4 (only one decimal)

I want two decimals, what to do? I tried some stuff with the (double) function, but didn't really work out. What to do?

Answer 1

You can use number_format :

$b = $del['Antal'];
$y = $info['Pris'];
$z = number_format($y * $b ,2);

The number_format function :

string number_format ( float $number [, int $decimals = 0 ] )

And if you don't want the default format :

string number_format ( float $number , int $decimals = 0 , string $dec_point = '.' , string $thousands_sep = ',' )