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1 <?php |
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2 /** |
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3 * Smarty plugin |
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4 * |
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5 * This plugin is only for Smarty2 BC |
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6 * @package Smarty |
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7 * @subpackage PluginsFunction |
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8 */ |
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9 |
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10 /** |
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11 * Smarty {math} function plugin |
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12 * |
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13 * Type: function<br> |
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14 * Name: math<br> |
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15 * Purpose: handle math computations in template |
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16 * |
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17 * @link http://www.smarty.net/manual/en/language.function.math.php {math} |
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18 * (Smarty online manual) |
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19 * @author Monte Ohrt <monte at ohrt dot com> |
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20 * @param array $params parameters |
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21 * @param Smarty_Internal_Template $template template object |
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22 * @return string|null |
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23 */ |
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24 function smarty_function_math($params, $template) |
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25 { |
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26 static $_allowed_funcs = array( |
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27 'int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true, |
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28 'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true, |
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29 'rand' => true, 'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true ,'tan' => true |
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30 ); |
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31 // be sure equation parameter is present |
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32 if (empty($params['equation'])) { |
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33 trigger_error("math: missing equation parameter",E_USER_WARNING); |
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34 return; |
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35 } |
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36 |
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37 $equation = $params['equation']; |
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38 |
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39 // make sure parenthesis are balanced |
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40 if (substr_count($equation,"(") != substr_count($equation,")")) { |
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41 trigger_error("math: unbalanced parenthesis",E_USER_WARNING); |
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42 return; |
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43 } |
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44 |
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45 // match all vars in equation, make sure all are passed |
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46 preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]*)!",$equation, $match); |
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47 |
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48 foreach($match[1] as $curr_var) { |
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49 if ($curr_var && !isset($params[$curr_var]) && !isset($_allowed_funcs[$curr_var])) { |
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50 trigger_error("math: function call $curr_var not allowed",E_USER_WARNING); |
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51 return; |
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52 } |
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53 } |
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54 |
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55 foreach($params as $key => $val) { |
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56 if ($key != "equation" && $key != "format" && $key != "assign") { |
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57 // make sure value is not empty |
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58 if (strlen($val)==0) { |
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59 trigger_error("math: parameter $key is empty",E_USER_WARNING); |
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60 return; |
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61 } |
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62 if (!is_numeric($val)) { |
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63 trigger_error("math: parameter $key: is not numeric",E_USER_WARNING); |
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64 return; |
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65 } |
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66 $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); |
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67 } |
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68 } |
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69 $smarty_math_result = null; |
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70 eval("\$smarty_math_result = ".$equation.";"); |
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71 |
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72 if (empty($params['format'])) { |
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73 if (empty($params['assign'])) { |
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74 return $smarty_math_result; |
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75 } else { |
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76 $template->assign($params['assign'],$smarty_math_result); |
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77 } |
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78 } else { |
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79 if (empty($params['assign'])){ |
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80 printf($params['format'],$smarty_math_result); |
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81 } else { |
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82 $template->assign($params['assign'],sprintf($params['format'],$smarty_math_result)); |
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83 } |
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84 } |
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85 } |
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86 |
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87 ?> |