Using submit button to send data to PHP script - php

Question

I'm making a math quiz where the user inputs their answer choice using radio buttons. I want to take the value of the radio button and compare it with the actual answer and increment score if the answer is correct.
At the moment, we are using a submit button at the bottom of the quiz where we are trying to send the data for the "check answers" script. However, I don't think any data is being pulled correctly.
Here is the code for the radio button which is from a form called "mathselect.php"
<?php //php starts here
require("opendbomath.php");
global $link, $DBname ;
if (!empty($_GET)) {
$category = $_GET["category"];
$sql = "SELECT * FROM `math`";
$result = mysqli_query($link,$sql);
$numOfQuestions = "SELECT COUNT(*) FROM `math`";
$queryNumOfQuestions = mysqli_query($link,$numOfQuestions);
if ($queryNumOfQuestions=mysqli_query($link,$sql))
{
// Return the number of rows in database
$rowcount=mysqli_num_rows($queryNumOfQuestions); //this is number of total rows
printf("Result set has %d rows.\n<br><br>",$rowcount);
}
$list = array();
$questionNumber = 0;
while (count($list) < 10){
do { //this is where we pull questions from database
$randomInt = rand(2,$rowcount); //random int is inbetween 2 and numbers of rows
$sqlselect = "SELECT * FROM `math` WHERE `bid` = \"" . $randomInt . "\" AND `acategory` = \"" . $category . "\" ";
$sqlSelectQuery = mysqli_query($link,$sqlselect);
$numOfGoodQuestions = mysqli_num_rows($sqlSelectQuery);
} while ($numOfGoodQuestions == 0); //if it returns blank field, it will loop again
if (in_array($randomInt,$list)){ //if it pulls duplicate number, continue
continue;
}
else {
//use fetch function
$row=mysqli_fetch_array($sqlSelectQuery);
$questionNumber = $questionNumber + 1;
$strQuestionNumber = (string)$questionNumber;
$slots = array();
array_push($slots,$row['aanswer']); //pushes answer choices into slots array
array_push($slots,$row['awrong1']);
array_push($slots,$row['awrong2']);
array_push($slots,$row['awrong3']);
shuffle($slots); //shuffles the answer choices
?>
<form action="mathcheck.php" method="post">
<?php
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[0]'>".$slots[0]."<br>"); //displaying 4 radio buttons with value of answer choice
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[1]'>".$slots[1]."<br>");
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[2]'>".$slots[2]."<br>");
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[3]'>".$slots[3]."<br>");
print("<br>");
}
}
//submit buton will go here
?>
<input type ="submit" value = "submit">
</form>
And also, here is the code for the "check answer" script which is called "mathcheck.php"
<?php
include('mathselect.php');
$answerChoice1 = $_POST('test1'); //pulls value of radio button
echo $answerchoice1;
$answerChoice2 = $_POST('test2');
$answerChoice3 = $_POST('test3');
$answerChoice4 = $_POST('test4');
$answerChoice5 = $_POST('test5');
$answerChoice6 = $_POST('test6');
$answerChoice7 = $_POST('test7');
$answerChoice8 = $_POST('test8');
$answerChoice9 = $_POST('test9');
$answerChoice10 = $_POST('test10');
$correctAnswer = $row['aanswer'];
$score = 0;
if ($answerchoice1 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice2 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice3 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice4 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice5 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice6 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice7 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice8 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice9 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
if ($answerchoice10 == $correctAnswer){
$score = $score + 1;
} else {
$score = $score;
}
So, when I click on the submit button of the form, I get directed to the mathcheck script with an error. Here is the link to the quiz with the submit button for reference.
http://socialsoftware.purchase.edu/nicholas.roberts/mathquiz/mathselect.php?category=Calculus

Answer 1

change all of your $_POST('x') to $_POST['x']
as it stands now you are trying to access it like a function not an array.

Answer 2

You are loading $correctanswer once. It's not changed for every question ? SO, you need to load each answer before you do the check for that question.

Answer 3

You may have more problems on your code, I couldn't check everything but you may start by putting the input fields inside the form tag, i.e.:
<form action="mathcheck.php" method="post">
<?php
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[0]'>".$slots[0]."<br>"); //displaying 4 radio buttons with value of answer choice
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[1]'>".$slots[1]."<br>");
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[2]'>".$slots[2]."<br>");
print ("<input type = 'radio' name='test".$strQuestionNumber."' value ='$slots[3]'>".$slots[3]."<br>");
print("<br>");
}
}
?>
<input type ="submit" value = "submit">
</form>
Also, the correct syntax of $_POST is:
$_POST['test2'];
NOT
$_POST('test2');