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