{math} allows the template designer to do math equations
in the template.
Any numeric template variables may be used in the equations, and the result is printed in place of the tag.
The variables used in the equation are passed as parameters, which can be template variables or static values.
+, -, /, *, abs, ceil, cos, exp, floor, log, log10, max, min, pi, pow, rand, round, sin, sqrt, srans and tan are all valid operators. Check the PHP documentation for further information on these math functions.
If you supply the
assignattribute, the output of the{math}function will be assigned to this template variable instead of being output to the template.
Technical Note
{math} is an expensive function in performance due to
its use of the php
eval() function. Doing the math in PHP is much
more efficient, so whenever possible do the math calculations in the script
and assign()
the results to the template. Definitely avoid repetitive
{math} function calls, eg within
{section} loops.
| Attribute Name | Type | Required | Default | Description |
|---|---|---|---|---|
| equation | string | Yes | n/a | The equation to execute |
| format | string | No | n/a | The format of the result (sprintf) |
| var | numeric | Yes | n/a | Equation variable value |
| assign | string | No | n/a | Template variable the output will be assigned to |
| [var ...] | numeric | Yes | n/a | Equation variable value |
Пример 8.21. {math}
Пример a:
{* $height=4, $width=5 *}
{math equation="x + y" x=$height y=$width}
The above example will output:
9
Пример b:
{* $row_height = 10, $row_width = 20, #col_div# = 2, assigned in template *}
{math equation="height * width / division"
height=$row_height
width=$row_width
division=#col_div#}
The above example will output:
100
Пример c:
{* you can use parenthesis *}
{math equation="(( x + y ) / z )" x=2 y=10 z=2}
The above example will output:
6
Пример d:
{* you can supply a format parameter in sprintf format *}
{math equation="x + y" x=4.4444 y=5.0000 format="%.2f"}
The above example will output:
9.44