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Source for file function.math.php

Documentation is available at function.math.php

  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.         $smarty->trigger_error("math: unbalanced parenthesis");
  34.         return;
  35.     }
  36.  
  37.     // match all vars in equation, make sure all are passed
  38.     preg_match_all("!\!(0x)([a-zA-Z][a-zA-Z0-9_]*)!",$equation, $match);
  39.     $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
  40.                            'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
  41.     foreach($match[2] as $curr_var) {
  42.         if (!in_array($curr_var,array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {
  43.             $smarty->trigger_error("math: parameter $curr_var not passed as argument");
  44.             return;
  45.         }
  46.     }
  47.  
  48.     foreach($params as $key => $val) {
  49.         if ($key != "equation" && $key != "format" && $key != "assign") {
  50.             // make sure value is not empty
  51.             if (strlen($val)==0) {
  52.                 $smarty->trigger_error("math: parameter $key is empty");
  53.                 return;
  54.             }
  55.             if (!is_numeric($val)) {
  56.                 $smarty->trigger_error("math: parameter $key: is not numeric");
  57.                 return;
  58.             }
  59.             $equation = preg_replace("/\b$key\b/",$val, $equation);
  60.         }
  61.     }
  62.  
  63.     eval("\$smarty_math_result = ".$equation.";");
  64.  
  65.     if (empty($params['format'])) {
  66.         if (empty($params['assign'])) {
  67.             return $smarty_math_result;
  68.         } else {
  69.             $smarty->assign($params['assign'],$smarty_math_result);
  70.         }
  71.     } else {
  72.         if (empty($params['assign'])){
  73.             printf($params['format'],$smarty_math_result);
  74.         } else {
  75.             $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result));
  76.         }
  77.     }
  78. }
  79.  
  80. /* vim: set expandtab: */
  81.  
  82. ?>
Documentation generated on Tue, 24 Oct 2006 09:22:42 -0500 by phpDocumentor 1.3.1