testing part numbers

[wright67uk]

How can I test a number for digits after a decimal point?

 

I would like to do somthing like;

 

$num = 5.34

If the digits after the decimal point of $num are less than .10 then round down, else

$num++

 

The idea being that this could be used in a loop until either a whole number is found, or until a number is rounded down.

[Barand]

 

$decimal = $num - floor($num);