PHP: Round number to two decimal places

If you want to output the number, I suggest using the PHP function number_format, that you can use like this:

$num = 1.234567
echo number_format($num, 2, ',', '.');
// output: 1,23

The first parameter is the number, the second the number of decimal places, the third is the decimal separator (a comma in this case), and the fourth the thousands separator (a point here). The last two parameters can be omitted as well, but by using them we can define exactly whether we would like to use the Amercian or another spelling of numbers. Otherwise, this is decided by the system, we are running our script on.

However, if you want to write the rounded number in a variable, you can proceed as follows:

$num = 1.234567;
$num = floor($num*100)/100;
echo $num;
// output: 1,23

Then you can go on calculating with the rounded number in your script.
2012-06-22 at 16:26

You can also work with sprintf, here's a quick example:

echo sprintf ("% 01.2f", $ num);

The function sprintf() is quite extensive and has numerous options.

In short, the first parameter is the format, the second is the number that you are passing. The f stands for a floating number, the 2 stands for the two decimal places.
2012-10-02 at 19:46