New in version 3.2.
Calculates the log of a number in the specified base and returns the result as a double.
$loghas the following syntax:
<number>expression can be any valid expression as long as it resolves to a non-negative number.
<base>expression can be any valid expression as long as it resolves to a positive number greater than
For more information on expressions, see Expressions.
If either argument resolves to a value of
null or refers to a field that is missing,
null. If either argument resolves to