Sharing a session variable between multiple php scripts - php

Question

My question is that when I copy my array elements between different PHP scripts using session variables, nothing gets printed out. The following are my two PHP files.
file1.php
<?PHP
session_start();
$SQL = "SELECT * FROM tblquestions";
if ($db_found) {
$result = mysql_query($SQL);
$numRows = mysql_num_rows($result); //return number of rows in the table
echo '<FORM NAME ="form1" METHOD ="POST" ACTION ="file2.php">';
for ($i = 1; $i <= 2; $i++)
{
$db_field = mysql_fetch_assoc($result);
$qID[$i] = $db_field['QID'];
$question[$i] = $db_field['Question'];
$A[$i] = $db_field['qA'];
$B[$i] = $db_field['qB'];
$C[$i] = $db_field['qC'];
echo '<P>';
print $question[$i];
echo '<P>';
echo "<INPUT TYPE = 'Radio' Name = '".$qNum."' value= 'A'>";
print $A[$i];
echo '<P>';
echo "<INPUT TYPE = 'Radio' Name = '".$qNum."' value= 'B'>";
print $B[$i];
echo '<P>';
echo "<INPUT TYPE = 'Radio' Name = '".$qNum."' value= 'C'>";
print $C[$i];
//if (isset($_POST[$name_Value]))
$survey_Answers[$i-1] = $_POST[$qNum];
print '</BR>'.$survey_Answers[$i-1]."</BR>";
$question_Number = ltrim($qNum,'q');
$question_Number++;
$qNum ='q'.$question_Number;
}
echo '<p>';
$_SESSION['answers'] = $survey_Answers;
echo '<INPUT TYPE = "Submit" Name = "Submit1" VALUE = "Click here to vote">';
echo '</form>';
?>
On my Second file (file2.php), I have the following:
<?PHP
session_start();
if (isset($_POST['Submit1'])) {
$results = $_SESSION['answers'];
print $results[0];
}
?>
However, on my file2.php I get the following error: Undefined offset: 0 and nothing gets printed out.

Answer 1

echo '<p>';
session_start();
that can´t work, session_start has to be called before any output!
if you put session_start() at the beginning of your file, you should be all right.

Answer 2

To use cookie-based sessions, session_start() must be called before outputing anything to the browser.
source: http://php.net/manual/en/function.session-start.php
You need to call session_start() before you output anything. It is a best practice to place it at the beginning of your script before you output anything.

Answer 3

Please Add the below code to every page you want to use the session data.Other wise it will return an error .
<?php
session_start();
?>

Answer 4

in file1.php session_start(); should be first line of the code same as in file2.php

Answer 5

There is a comment on the PHP manual page for session_start() which sounds very similar to your problem. http://php.net/manual/en/function.session-start.php#65944
It says that an array with integer keys assigned either as a straight array or using the integers will fail and the data will not pass to the next page.
Modify your code to use strings as keys.