4 * This plugin is only for Smarty2 BC
7 * @subpackage PluginsFunction
11 * Smarty {math} function plugin
14 * Purpose: handle math computations in template
16 * @link http://www.smarty.net/manual/en/language.function.math.php {math}
17 * (Smarty online manual)
18 * @author Monte Ohrt <monte at ohrt dot com>
20 * @param array $params parameters
21 * @param Smarty_Internal_Template $template template object
25 function smarty_function_math($params, $template)
27 static $_allowed_funcs = array(
28 'int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true,
29 'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true,
30 'rand' => true, 'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true, 'tan' => true
32 // be sure equation parameter is present
33 if (empty($params['equation'])) {
34 trigger_error("math: missing equation parameter", E_USER_WARNING);
39 $equation = $params['equation'];
41 // make sure parenthesis are balanced
42 if (substr_count($equation, "(") != substr_count($equation, ")")) {
43 trigger_error("math: unbalanced parenthesis", E_USER_WARNING);
48 // match all vars in equation, make sure all are passed
49 preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]*)!", $equation, $match);
51 foreach ($match[1] as $curr_var) {
52 if ($curr_var && !isset($params[$curr_var]) && !isset($_allowed_funcs[$curr_var])) {
53 trigger_error("math: function call $curr_var not allowed", E_USER_WARNING);
59 foreach ($params as $key => $val) {
60 if ($key != "equation" && $key != "format" && $key != "assign") {
61 // make sure value is not empty
62 if (strlen($val) == 0) {
63 trigger_error("math: parameter $key is empty", E_USER_WARNING);
67 if (!is_numeric($val)) {
68 trigger_error("math: parameter $key: is not numeric", E_USER_WARNING);
72 $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
75 $smarty_math_result = null;
76 eval("\$smarty_math_result = " . $equation . ";");
78 if (empty($params['format'])) {
79 if (empty($params['assign'])) {
80 return $smarty_math_result;
82 $template->assign($params['assign'], $smarty_math_result);
85 if (empty($params['assign'])) {
86 printf($params['format'], $smarty_math_result);
88 $template->assign($params['assign'], sprintf($params['format'], $smarty_math_result));