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   1  <?php
   2  /**

   3   * Smarty plugin

   4   * @package Smarty

   5   * @subpackage plugins

   6   */
   7  
   8  
   9  /**

  10   * Smarty {math} function plugin

  11   *

  12   * Type:     function<br>

  13   * Name:     math<br>

  14   * Purpose:  handle math computations in template<br>

  15   * @link http://smarty.php.net/manual/en/language.function.math.php {math}

  16   *          (Smarty online manual)

  17   * @param array

  18   * @param Smarty

  19   * @return string

  20   */
  21  function smarty_function_math($params, &$smarty)
  22  {
  23      // be sure equation parameter is present

  24      if (empty($params['equation'])) {
  25          $smarty->trigger_error("math: missing equation parameter");
  26          return;
  27      }
  28  
  29      $equation = $params['equation'];
  30  
  31      // make sure parenthesis are balanced

  32      if (substr_count($equation,"(") != substr_count($equation,")")) {
  33          $smarty->trigger_error("math: unbalanced parenthesis");
  34          return;
  35      }
  36  
  37      // match all vars in equation, make sure all are passed

  38      preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match);
  39      $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
  40                             'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
  41      
  42      foreach($match[1] as $curr_var) {
  43          if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {
  44              $smarty->trigger_error("math: function call $curr_var not allowed");
  45              return;
  46          }
  47      }
  48  
  49      foreach($params as $key => $val) {
  50          if ($key != "equation" && $key != "format" && $key != "assign") {
  51              // make sure value is not empty

  52              if (strlen($val)==0) {
  53                  $smarty->trigger_error("math: parameter $key is empty");
  54                  return;
  55              }
  56              if (!is_numeric($val)) {
  57                  $smarty->trigger_error("math: parameter $key: is not numeric");
  58                  return;
  59              }
  60              $equation = preg_replace("/\b$key\b/",$val, $equation);
  61          }
  62      }
  63  
  64      eval("\$smarty_math_result = ".$equation.";");
  65  
  66      if (empty($params['format'])) {
  67          if (empty($params['assign'])) {
  68              return $smarty_math_result;
  69          } else {
  70              $smarty->assign($params['assign'],$smarty_math_result);
  71          }
  72      } else {
  73          if (empty($params['assign'])){
  74              printf($params['format'],$smarty_math_result);
  75          } else {
  76              $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result));
  77          }
  78      }
  79  }
  80  
  81  /* vim: set expandtab: */

  82  
  83  ?>