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File: resources/Smarty/plugins/function.math.php

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File: resources/Smarty/plugins/function.math.php
Role: Example script
Content type: text/plain
Description: Example script
Class: Basic Controller Framework
Framework to route requests configured controllers
Author: By
Last change:
Date: 6 months ago
Size: 3,536 bytes
 

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<?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;
    }

   
// disallow backticks
   
if (strpos($equation, '`') !== false) {
       
trigger_error("math: backtick character not allowed in equation", E_USER_WARNING);

        return;
    }

   
// also disallow dollar signs
   
if (strpos($equation, '$') !== false) {
       
trigger_error("math: dollar signs not allowed in equation", 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;
            }
        }
    }

   
// match all vars in equation, make sure all are passed
   
preg_match_all('!(?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)!', $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 '{$curr_var}' not allowed, or missing parameter '{$curr_var}'", E_USER_WARNING);

            return;
        }
    }

    foreach (
$params as $key => $val) {
        if (
$key != "equation" && $key != "format" && $key != "assign") {
           
$equation = preg_replace("/\b$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));
        }
    }
}