85 lines
2.6 KiB
PHP
85 lines
2.6 KiB
PHP
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<?php
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/**
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* Smarty plugin
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* @package Smarty
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* @subpackage plugins
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*/
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/**
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* Smarty {math} function plugin
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*
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* Type: function<br>
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* Name: math<br>
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* Purpose: handle math computations in template<br>
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* @link http://smarty.php.net/manual/en/language.function.math.php {math}
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* (Smarty online manual)
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* @author Monte Ohrt <monte at ohrt dot com>
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* @param array
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* @param Smarty
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* @return string
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*/
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function smarty_function_math($params, &$smarty)
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{
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// be sure equation parameter is present
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if (empty($params['equation'])) {
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$smarty->trigger_error("math: missing equation parameter");
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return;
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}
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// strip out backticks, not necessary for math
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$equation = str_replace('`','',$params['equation']);
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// make sure parenthesis are balanced
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if (substr_count($equation,"(") != substr_count($equation,")")) {
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$smarty->trigger_error("math: unbalanced parenthesis");
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return;
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}
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// match all vars in equation, make sure all are passed
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preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]*)!",$equation, $match);
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$allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
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'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
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foreach($match[1] as $curr_var) {
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if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {
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$smarty->trigger_error("math: function call $curr_var not allowed");
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return;
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}
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}
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foreach($params as $key => $val) {
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if ($key != "equation" && $key != "format" && $key != "assign") {
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// make sure value is not empty
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if (strlen($val)==0) {
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$smarty->trigger_error("math: parameter $key is empty");
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return;
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}
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if (!is_numeric($val)) {
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$smarty->trigger_error("math: parameter $key: is not numeric");
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return;
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}
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$equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
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}
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}
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eval("\$smarty_math_result = ".$equation.";");
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if (empty($params['format'])) {
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if (empty($params['assign'])) {
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return $smarty_math_result;
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} else {
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$smarty->assign($params['assign'],$smarty_math_result);
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}
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} else {
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if (empty($params['assign'])){
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printf($params['format'],$smarty_math_result);
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} else {
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$smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result));
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}
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}
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}
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/* vim: set expandtab: */
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?>
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