variable not found in php - php

Question

i passed an array to another page using session
i also passed an index of array
now i want to access that particular index but i am not able to do so can anybody help
here is he first page where i have created the array and stored it in session
<?php
//connection made
$con = mysqli_connect("localhost", "root", "", "QSTNS");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
//-----------------two variables entered in datavbase------------
$user = mysqli_real_escape_string($con, $_POST['user']);
$user1 = mysqli_real_escape_string($con, $_POST['user1']);
$sql = "INSERT INTO student (name,rln,scr)VALUES ('$user1','$user','0')";
if (!mysqli_query($con, $sql)) {
die('Error: ' . mysqli_error($con));
}
$res = mysqli_query($con, 'SELECT COUNT(*) FROM qstns');
$row = mysqli_fetch_array($res);
echo $row[0];
$size = $row[0];
//creating an array of size equal to number of questions in DATABASE....
$q_indx = array(); //question indexes without permutation
$attmpt = array(); //check if a question attempted or not
$score = array(); //score per question initially empty
for ($i = 0; $i < $size; $i++) {
array_push($q_indx, $i);
array_push($attmpt, -1);
array_push($score, 0);
}
$cindx = 0;
session_start();
$_SESSION['q_indx'] = $q_indx; //HERE THAT SESSION IS CREATED
$_SESSION['attmpt'] = $attmpt;
$_SESSION['score'] = $score;
$_SESSION['cindx'] = $cindx;
header('Location: quiz_start.php');
mysqli_close($con);
?>
here is the quiz_start.php
<?php
session_start();
$con=mysqli_connect("localhost","root","","QSTNS");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$dslpy=$_SESSION['q_indx'][$_SESSION['cindx']] ;
echo $dsply ;
//$qstn = mysqli_query($con,"SELECT * FROM qstns where qid = '". $dsply[0]
."'");
//echo $qstn['qname'] . '\n';
mysqli_close($con);
?>
it is giving error dsply variable not found
can any body help ?

Answer 1

From this script, we can gather that $_SESSION['q_indx'] holds an array of numbers, as below;
Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
[4] => 4
)
From your code, $cindx = 0;, so we are looking at index 0. Therefore,
echo $_SESSION['q_indx'][0]; //One way of doing it
echo $_SESSION['q_indx'][$cindx]; //Another way of doing it
EDIT
Cannot use object of type mysqli_result as array in C:\wamp\www\quiiz_portal\quiz_start.php on line 12 can u tell why it there
Change your MySQL query to become
$qstn = mysqli_query($con, "SELECT * FROM qstns where qid = '". $dsply[0] ."'");
EDIT
You are missing session_start(); from your first file.