I really appreciate you taking another look at the code forum_amnesiac.
I did further testing and didn't have any luck, but I did however get this working. I had additional validation in another form structure that I have been using so I tested to see if it would work in that form and I didn't run into any issues.
Here is the MathGuard class as promised if anyone is interested.
Where you want to display the question in your form add:
PHP Code:
<? require("ClassMathGuard.php"); MathGuard::insertQuestion(); ?>
ClassMathGuard.php
PHP Code:
<?
class MathGuard {
/** A main hashing function: concat of user's answer, hour and the additional prime number (default 37) */
function encode($input, $prime) {
return md5($input.date("H").$prime);
}
/** This function generates the hash code from the two numbers
* @param $a first number
* @param $b second sumber
* @param $prime additional number to encode with
* */
function generateCode($a, $b, $prime) {
$code = MathGuard::encode($a + $b, $prime);
return $code;
}
/** This function checks whether the answer and generated security code match
* @param $mathguard_answer answer the user has entered
* @param $mathguard_code hashcode the mathguard has generated
*/
function checkResult($mathguard_answer, $mathguard_code, $prime = 37) {
// echo("prime; $prime, $mathguard_answer");
$result_encoded = MathGuard::encode($mathguard_answer, $prime);
if ($result_encoded == $mathguard_code)
return true;
else
return false;
}
/** this function inserts the two math term into your form, the parameter is optional */
function insertQuestion($prime = 37) { //default prime is 37, you can change it when specifying the different parameter
$a = rand() % 10; // generates the random number
$b = rand() % 10; // generates the random number
$code = MathGuard :: generateCode($a, $b, $prime);
echo ("Security question: $a + $b =
<input type='input' name='mathguard_answer' size='2'/><input type='hidden' name='mathguard_code' value='$code' />");
}
/** this function returns math expression into your form, the parameter is optional
* quite simmilar to insertQuestion, but returns the output as a text instead of echoing
*/
function returnQuestion($prime = 37) { //default prime is 37, you can change it when specifying the different parameter
$a = rand() % 10; // generates the random number
$b = rand() % 10; // generates the random number
$code = MathGuard :: generateCode($a, $b, $prime);
return ("Security question: $a + $b =
<input type='input' name='mathguard_answer' size='2'/><input type='hidden' name='mathguard_code' value='$code' />");
}
}
?>
In your validation you can add something like this to check the value submitted (change $error_msg to whatever you need to fit the rest of your validation)
PHP Code:
elseif (!( MathGuard :: checkResult($_REQUEST['mathguard_answer'], $_REQUEST['mathguard_code']))) {
$error_msg .= "Incorrect security question answer, please try again!";
}
using a function to create math check - issue with checking if correct
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