php number_format() where formating string is a variable

I get the following error when I try to use number format in php:

Notice: A non well formed numeric value encountered

$numbe开发者_开发技巧r = 10345.34543;
$format = "0, ',', '.'";
echo number_format($number, $format);

I am almost positive it is because I'm holding the formating part in a string, but is there any way around this?

Thanks.

The format you are trying to pass the arguments in is not possible. You are passing a string instead of an int.

The expected parameters are:

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

you will need to pass the arguments accordingly:

echo number_format($number, 0, ",", ".");

If you have a special reason to do this the way you show, you would have to use eval() which is highly discouraged, or maybe call_user_func_array() but you would have to explain in detail first what you are trying to do.