60 lines
1.9 KiB
PHP
60 lines
1.9 KiB
PHP
<?php
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/**
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* Tools for adding an optional protection question to a form.
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* Remember to add MathSpamProtection::enabled(true); to _config.php for this question to be added to the comments form.
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*/
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class MathSpamProtection {
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private static $mathProtection = false;
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static function isEnabled() {
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return (self::$mathProtection != null) ? true : false;
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}
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static function setEnabled($math = true) {
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MathSpamProtection::$mathProtection = $math;
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}
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/**
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* Creates the question from random variables, which are also saved to the session.
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*/
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static function getMathQuestion(){
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if(!Session::get("mathQuestionV1")&&!Session::get("mathQuestionV2")){
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$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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$v2 = Session::get("mathQuestionV2");
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}
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return "What is ".MathSpamProtection::digitToWord($v1)." plus ".MathSpamProtection::digitToWord($v2)."?";
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}
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/**
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* Checks the given answer if it matches the addition of the saved session variables. Users can answer using words or digits.
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*/
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static function correctAnswer($answer){
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$v1 = Session::get("mathQuestionV1");
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$v2 = Session::get("mathQuestionV2");
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return (MathSpamProtection::digitToWord($v1 + $v2) == $answer || ($v1 + $v2) == $answer) ? true : false;
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}
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/**
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* Helper method for converting digits to their equivelant english words
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*/
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static function digitToWord($num){
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$numbers = array("zero","one","two","three","four","five","six","seven","eight","nine",
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"ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen");
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if($num < 0){
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return "minus ".($numbers[-1*$num]);
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}
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//TODO: add checking or return null for bad value??
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return $numbers[$num];
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}
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}
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?>
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