send price such as 1000.50 using a form

[helenp]

Hi,
Been searching and trying,
I need to insert a price in a form to later insert into a mysql column wich is decimal(10,2).
The price needs to be like:
1000 or
1000.00 or
1000.50
Instead of 1 inputs wich looks more complicated to me I am trying to uso 2 inputs, wich I then join like this:
$holidaycost = $price.".".$decimal;
then I check the inputs with ctype_digit to check that only numbers where filled in.
It works perfect, however if the second input is left empty then I need to convert the empty field to 0, wich I cant manage.
Any ideas?

[helenp]

I think I should use one input and then format the price correctly.
I ever used filters or regex, and I think this is the filters I need to change 1.001.50 to 1000.50 however it does not work,
what am I doing wrong?
$var = filter_var($price,FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
echo $var;