$add

Usage: $add(x,y,*args)

Category: mathematical

Description:

Adds y to x. Can be used with an arbitrary number of arguments (i.e.: $add(x,y,z) = (x + y) + z). Returns an empty string if an argument is missing or not an integer.

Example:

The following statements will return the values indicated:

$add(20,15)      ==>  "35"
$add(20,-15)     ==>  "5"
$add(20,14,1)    ==>  "35"
$add(20,10,3,2)  ==>  "35"
$add(20,10,3,)   ==>  ""
$add(20,10,3,a)  ==>  ""
$add(20,10,3.5)  ==>  ""