mirror of
https://github.com/silverstripe/silverstripe-cms
synced 2024-07-03 09:59:25 +02:00
a578804987
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/branches/2.4@95194 467b73ca-7a2a-4603-9d3b-597d59a354a9
91 lines
2.5 KiB
PHP
91 lines
2.5 KiB
PHP
<?php
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/**
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* Tools for adding an optional Maths protection question to a form.
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*
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* @package cms
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* @subpackage comments
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*/
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class MathSpamProtection {
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private static $mathProtection = false;
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/**
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* Creates the question from random variables, which are also saved to the session.
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* @return String
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*/
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static function getMathQuestion(){
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if(!Session::get("mathQuestionV1")&&!Session::get("mathQuestionV2")){
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$v1 = rand(1,9);
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$v2 = rand(1,9);
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Session::set("mathQuestionV1",$v1);
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Session::set("mathQuestionV2",$v2);
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}
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else{
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$v1 = Session::get("mathQuestionV1");
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$v2 = Session::get("mathQuestionV2");
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}
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return sprintf(
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_t('MathSpamProtection.WHATIS',"What is %s plus %s?"),
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MathSpamProtection::digitToWord($v1),
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MathSpamProtection::digitToWord($v2)
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);
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}
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/**
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* Checks the given answer if it matches the addition of the saved session variables. Users can answer using words or digits.
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*/
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static function correctAnswer($answer){
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$v1 = Session::get("mathQuestionV1");
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$v2 = Session::get("mathQuestionV2");
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Session::clear('mathQuestionV1');
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Session::clear('mathQuestionV2');
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if(MathSpamProtection::digitToWord($v1 + $v2) == $answer || ($v1 + $v2) == $answer){
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return true;
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}
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return false;
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}
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/**
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* Helper method for converting digits to their equivelant english words
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*/
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static function digitToWord($num){
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$numbers = array(_t('MathSpamProtection.ZERO', 'zero'),
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_t('MathSpamProtection.ONE', 'one'),
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_t('MathSpamProtection.TWO', 'two'),
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_t('MathSpamProtection.THREE', 'three'),
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_t('MathSpamProtection.FOUR', 'four'),
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_t('MathSpamProtection.FIVE', 'five'),
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_t('MathSpamProtection.SIX', 'six'),
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_t('MathSpamProtection.SEVEN', 'seven'),
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_t('MathSpamProtection.EIGHT', 'eight'),
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_t('MathSpamProtection.NINE', 'nine'),
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_t('MathSpamProtection.TEN', 'ten'),
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_t('MathSpamProtection.ELEVEN', 'eleven'),
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_t('MathSpamProtection.TWELVE', 'twelve'),
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_t('MathSpamProtection.THIRTEEN', 'thirteen'),
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_t('MathSpamProtection.FOURTEEN', 'fourteen'),
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_t('MathSpamProtection.FIFTEEN', 'fifteen'),
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_t('MathSpamProtection.SIXTEEN', 'sixteen'),
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_t('MathSpamProtection.SEVENTEEN', 'seventeen'),
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_t('MathSpamProtection.EIGHTEEN', 'eighteen'));
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if($num < 0) return "minus ".($numbers[-1*$num]);
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return $numbers[$num];
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}
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static function isEnabled() {
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return self::$mathProtection;
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}
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static function setEnabled($math = true) {
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self::$mathProtection = $math;
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}
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} |