<?php /** * Smarty plugin * This plugin is only for Smarty2 BC * * @package Smarty * @subpackage PluginsFunction */ /** * Smarty {math} function plugin * Type: function<br> * Name: math<br> * Purpose: handle math computations in template * * @link http://www.smarty.net/manual/en/language.function.math.php {math} * (Smarty online manual) * @author Monte Ohrt <monte at ohrt dot com> * * @param array $params parameters * @param Smarty_Internal_Template $template template object * * @return string|null */ function smarty_function_math($params, $template) { static $_allowed_funcs = array( 'int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true, 'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true, 'rand' => true, 'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true, 'tan' => true ); // be sure equation parameter is present if (empty($params['equation'])) { trigger_error("math: missing equation parameter", E_USER_WARNING); return; } $equation = $params['equation']; // make sure parenthesis are balanced if (substr_count($equation, "(") != substr_count($equation, ")")) { trigger_error("math: unbalanced parenthesis", E_USER_WARNING); 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, $match); foreach ($match[1] as $curr_var) { if ($curr_var && !isset($params[$curr_var]) && !isset($_allowed_funcs[$curr_var])) { trigger_error("math: function call $curr_var not allowed", E_USER_WARNING); return; } } foreach ($params as $key => $val) { if ($key != "equation" && $key != "format" && $key != "assign") { // make sure value is not empty if (strlen($val) == 0) { trigger_error("math: parameter $key is empty", E_USER_WARNING); return; } if (!is_numeric($val)) { trigger_error("math: parameter $key: is not numeric", E_USER_WARNING); return; } $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); } } $smarty_math_result = null; eval("\$smarty_math_result = " . $equation . ";"); if (empty($params['format'])) { if (empty($params['assign'])) { return $smarty_math_result; } else { $template->assign($params['assign'], $smarty_math_result); } } else { if (empty($params['assign'])) { printf($params['format'], $smarty_math_result); } else { $template->assign($params['assign'], sprintf($params['format'], $smarty_math_result)); } } }