session variable not set at all

hosseini · August 7, 2013

hi all , I have to system running Ubuntu 13.04 . on my laptop everything works fine but on my PC I can not work with session variable , I have installed Apache2 and PHP from terminal ,i'm running a same code on both devices.

the code that I used for checking if the variable is set or not on every page is :

<?php

session_start();

if(!isset($_SESSION["mys"]))

{

header('location:../index.php');

}

?>

as you can see if the variable do not set , user would redirect to the index page .

the problem is my session variable is not getting set at all , this is a code that i ran on both devices :

<?php
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<link REL="SHORTCUT ICON" HREF="qeshmac.ico">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<?php

include 'mytool.php';
         if(isset($_POST["myusername"]))
			{
				// username and password sent from form
				$myusername=$_POST['myusername'];
				$mypassword=$_POST['mypassword'];
		
				$host='localhost'; // Host name
				$username='root'; // Mysql username
				$password=''; // Mysql password
				switch ($_POST['tabs'])
				{
					case 'students':
					$db_name='students'; // Database name
					$tbl_name='test'; // Table name
					break;
					
					case'teachers':
					$db_name='managers'; // Database name
					$tbl_name='teachers'; // Table name
					break;
					
					case'managers':
					$db_name='managers'; // Database name
					$tbl_name='employes'; // Table name
					break;
					
					case'admin':
					$db_name='managers'; // Database name
					$tbl_name='moderator'; // Table name
					break;
				}
				
				
				// Connect to server and select database.
			  
				
				 mysql_connect($host,$username,$password)or die("cannot connect");
				 $selected=mysql_select_db($db_name)or die("cannot select DB");
				 mysql_query("SET CHARACTER SET utf8;");
				 mysql_query("SET SESSION collation_connection = 'utf8_persian_ci'"); 


				$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and
				password='$mypassword'";

				$result=mysql_query($sql);
				

				if(mysql_fetch_assoc($result))
					{
					    switch ($_POST['tabs'])
						{
							case 'students':
							$_SESSION["mys"]=$myusername;		
							print( redirect('student/index.php'));
							break;
							
							case 'teachers':
							$_SESSION["mys"]=$myusername;		
							print( redirect('teachers/index.php'));
							break;
							
							case 'managers':
							$_SESSION["mys"]=$myusername;		
							print( redirect('managers/index.php'));
							break;
							
							case 'admin':
							$_SESSION["mys"]=$myusername;		
							print( redirect('admin/index.php'));
							break;
						}
					}
					
			
					else
					{
						//back to login
						print( redirect('index.php?cmd=error'));
					}
			}
					else
					{
					print( redirect('index.php'));
					}

?>

</body>
</html>

Edited August 7, 2013 by hosseini

JonnoTheDev · August 7, 2013

All this logic should come before any HTML output. I have cleaned up the code a bit.

<?php
session_start();
include 'mytool.php';
if(isset($_POST['myusername']) && isset($_POST['mypassword']))
{
	// username and password sent from form
	$myusername = $_POST['myusername'];
	$mypassword = $_POST['mypassword'];
	$host = 'localhost'; // Host name
	$username = 'root'; // Mysql username
	$password = ''; // Mysql password
	
	if(isset($_POST['tabs']))
	{
		switch ($_POST['tabs'])
		{
			case 'students':
				$db_name = 'students'; // Database name
				$tbl_name = 'test'; // Table name
				$redirect = 'student/index.php';
			break;
			case 'teachers':
				$db_name = 'managers'; // Database name
				$tbl_name = 'teachers'; // Table name
				$redirect = 'teachers/index.php';
			break;
			case 'managers':
				$db_name = 'managers'; // Database name
				$tbl_name = 'employes'; // Table name
				$redirect = 'managers/index.php';
			break;
			case'admin':
				$db_name = 'managers'; // Database name
				$tbl_name = 'moderator'; // Table name
				$redirect = 'admin/index.php';
			break;
		}
	}
	else
	{
		die('Missing var: tabs');
	}
	
	// Connect to server and select database.
	mysql_connect($host, $username, $password)or die("cannot connect");
	$selected = mysql_select_db($db_name)or die("cannot select DB");
	
	if(!$res = mysql_query("SET CHARACTER SET utf8;"))
	{
		die(mysql_error());	
	}
	if(!$res = mysql_query("SET SESSION collation_connection = 'utf8_persian_ci'"))
	{
		die(mysql_error());	
	}
 
 
	$sql = "SELECT * FROM " . $tbl_name . " WHERE username='" . $myusername . "' AND password='" . $mypassword . "'";
 	if(!$result = mysql_query($sql))
	{
		die(mysql_error());	
	}
 
	if(mysql_num_rows($result))
	{		
		$row = mysql_fetch_assoc($result); // not sure why you are not using the pk from the result set in your session var
		$_SESSION['mys'] = $myusername;
		header('Location:' . $redirect);
		exit();
	}
	else
	{
		//back to login
		header('Location:index.php?cmd=error');
		exit();
	}
}
else
{
	header('Location:index.php');
	exit();
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<link REL="SHORTCUT ICON" HREF="qeshmac.ico">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
</body>
</html>

hosseini · August 7, 2013

tnx for you help but your code is not working too I don't know what is the problem ! everything is ok but the session variable is not getting set ! the funny thing is my other project session variables are working but not this one !

mac_gyver · August 7, 2013

do you have php's error_reporting set to E_ALL and display_errors set to ON so that php would help you with things like session_start() error?

also, have you even determined that your code is taking the execution path you think it is and is setting the $_SESSION variable to a specific expected value?

hosseini · August 7, 2013

do you have php's error_reporting set to E_ALL and display_errors set to ON so that php would help you with things like session_start() error?

also, have you even determined that your code is taking the execution path you think it is and is setting the $_SESSION variable to a specific expected value?

yes I have error reporting on my codes but this one as i told was working fine on my laptop and on my pc it's not working .

I've found what was wrong . the local server on my ubuntu desktop didn't install properly , so I will reinstall it to see if it is gonna work !

hosseini · August 7, 2013

It was php.ini problem with session path and I solved it tnx in advance for your guys help

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