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To deliver maximum flexibility, the activity parameters allow the use of special expressions whose values are calculated at run time. To specify that a parameter value is an expression, use the Excel-like notation – that is, start the value with an "equals" sign: =. In other words: an expression is anything that is prepended with an equals sign.

Examples:

=6^2 + {=Document:PROPERTY_NUM}/2

=if({Document:ID}=5, "text1", "text2")

A parameter can use only one expression. To use multiple expressions in a parameter, use the concatenation operator (&), and enclose text in the expressions in double quotes (") as needed.

Examples:

="Reply:" & (1+3)

="Author: " & {=Document:CREATED_BY} & ", " & "Deadline: " & Dateadd({=Document:DATE_CREATE}, "1d")

As you will see below, the syntax of operators and functions in expressions is largely based on the syntax of those in PHP.

The following operators and functions are possible.

• + - adds two values;
• - - subtracts the second value from the first one;
• * - multiplies two values;
• / - divides the first value by the second one;
• = - assigns (i.e. returns) the expression result;
• <> - not equal;
• < - less than;
• > - more than;
• <= - less than or equal;
• >= - more than or equal;
• () - round brackets;
• & - concatenation operator. Return a new string which is the left string plus the right string;
• ^ - power;
• % - percent;
• true - Boolean true;
• false - Boolean false;
• and - Boolean AND;
• or - Boolean OR;
• not - Boolean NOT;
• min - returns the minimum of the two values;
• abs - returns the absolute value of an argument;
• dateadd - adds the time span passed as the second argument to the date specified as the first argument.

  Syntax:

  =dateadd([initial date], [time span])

  The following units are possible in the time span: y, year, years, m, month, months, d, day, days, h, hour, hours, i, min, minute, minutes, s, second, seconds. The units are case insensitive.

  Examples:

  =Dateadd({=Document:DATE_CREATE}, "-2d")

  =Dateadd({=Document:DATE_CREATE}, "2 days 3 minutes")

• datediff - Returns the difference between two dates.

  Syntax:

  =datediff([date1], [date2], [difference_display_format]);

  The difference can be displayed in various units.

  Example: =datediff({=Variable:Variable1}, {=Variable:Variable2},'%m month, %d days')

• if - specifies a condition;

  Syntax:

  =if([condition], [expression if true], [expression if false])

  Example:

  =if ({=Variable:Variable1_printable}>0, "yes", "no")

• intval - returns the integer of the value passed as the parameter;

  Example:

  =intval("234j4hv5jhv43v53jk4vt5hj4") returns 234 because the value starts with this number, and the character immediately following the "4" is not a number.

• substr - returns the portion of a string as specified by the last two parameters. See http://www.php.net/manual/en/function.substr.php for details.