$calculate[]

The $calculate[] function is the most powerful mathematical function in BDFD. It allows you to evaluate complex mathematical expressions using an integrated math parser.

Syntax

$calculate[expression]

Parameters

Parameter	Type	Required	Description
expression	string	Yes	The mathematical expression to evaluate.

Supported Operators

Operator	Description	Example
+	Addition	5 + 3 → 8
-	Subtraction	10 - 4 → 6
*	Multiplication	6 * 7 → 42
/	Division	15 / 3 → 5
%	Modulo	17 % 5 → 2
^	Exponentiation	2 ^ 8 → 256

Supported Functions

sin, cos, tan, asin, acos, atan, abs, sqrt, log, log10, floor, ceil, round, min, max, exp

Comparisons

Comparisons return "true" or "false":

• > strictly greater than
• < strictly less than
• >= greater than or equal to
• <= less than or equal to
• == equal to
• != not equal to

Notes

• The expression is evaluated with a server-side math parser.
• The result is always returned as a character string (even for numbers).
• The function supports the use of BDFD variables like $getVar[] in the expression.
• In case of an invalid expression, the behavior depends on the parser (usually a silent error or an empty result).