eeeeeeeek.... Session Clashes!

OilSheikh · May 1, 2007

Hi,

I copied this code from a Site's Shopping Cart Tutorial and it doens't work! Yes, I copied it carefully and followed all the advice! But, I just get this error -

[color=navy]

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\menu.php: in C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\SQL2.php on line 13

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\menu.php: in C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\SQL2.php on line 14


[/color]

Menu.php is a CSS based menu. No PHP or SQL in it.

I fear that the session started in SQL2.php is conflicting with the session already started during LOGIN

LOGIN.PHP


<?php

ob_start(); 

include("menu.php"); 
include("SQL.php"); 
  
#########	CHECKS THAT FIELDS ARE NOT EMPTY	##########
if (isset($_POST ['submit']))
{
$usern = $_POST['username'];
$passw = $_POST['pass'];
$encryptedpass = md5($_POST['pass']);

	if (!$usern | !$passw)
	{
		die ('<br><br><br><font face="Verdana" size="4" color = red>ERROR: Please make sure that all Information is provided.</font> <br><br> <input type="button" value="  Retry  " onClick="history.go(-1)"> ');
	}

#########	CHECKS IF username AND CORRESPONDING password EVEN EXIST !	##########

	$check = mysql_query("SELECT * FROM customer WHERE username = '$usern' AND password = 	'$encryptedpass' ")
	or die(mysql_error());
	$check2 = mysql_num_rows($check);

	if ($check2 == 1)
	{
		session_register("usern");
		session_register("passw");
		header("location:acc.php");	
	}					
	else if ($check2 == 0)
	{	 	   	
    	 die ('<br><br><br><font face="Verdana" size="4" color = red>ERROR : The Username and/or Password you have entered does not exist. <br><br>If you are a New User, please <a href = "register.php"><u>Register</u></a> first. </font> <br><br> <input type="button" value="  Retry  " onClick="history.go(-1)">');		 
	}
}
	else 

{
ob_end_flush();
?>
<html>
<head>
<title>Login to your Account or Register for a new Account</title>
<link rel="stylesheet" href="styler.css">
</head>
<body>
<br><br><br>
<h2>Please Log in to view Your Account<br><br></h2>
<h3>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<table border="0" width="101%" cellspacing="1" id="table1" bordercolorlight="#0066FF" height="75">
<tr>
	<td width="106" height="48">Username</td>
	<td height="48" width="259"> <input type = "text" name = "username" size="34" maxlength ="7" style = "color:blue"></td>
	<td height="48" width="32"> </td>
	<td height="95" rowspan="2">Are you a New User ? Please Register.</td>
</tr>
<tr>
	<td width="106" height="47">Password</td>
	<td height="47" width="259"> <input type = "password" name = "pass" size="34" maxlength = "7" style = "color:blue"></td>
	<td height="47" width="32"> </td>
</tr>
<tr>
	<td width="106"> </td>
	<td width="259"> </td>
	<td width="32"> </td>
	<td> </td>
</tr>
<tr>
	<td width="106"> </td>
	<td width="259">
	<p align="center">
	<input type = "submit" name = "submit" value = "" style="background : url(login.jpg);	width:107px; height:25px; ">
	</td>
	<td width="32"> 
	</td>
	<td>
	<a href="register.php">
	<img border="0" src="reg.jpg" width="101" height="20"></a></td>
</tr>
<tr>
	<td width="106"> </td>
	<td width="259"> 
	</td>
	<td width="32"> 
	</td>
	<td> 
	</td>
</tr>
<tr>
	<td width="365" colspan="2"><font size="2">Forgotten your Password?  
	<span style="background-color: #FFFFFF">
	<a href="recover.php">Recover your password</a>.</span></font></td>
	<td width="32"> 
	</td>
	<td> 
	</td>
</tr>
</table>
</form>
</h3>
<?php include("base.php"); ?>
</body>
</html>
<?php
}

?>

Here's the SQL2.php code

  <?php
  	mysql_connect ("localhost", "root" , "zforce") or die (mysql_error());
mysql_select_db("express") or die (mysql_error());

function GetCartId()
{
if (isset($_COOKIE["cartid"]) )
{
	return $_COOKIE["cartid"];
}
else
{
	session_start();
	setcookie("cartid",session_id(),time()+((3600*24)*2) );
	return session_id();
}
}

  ?>

Here's the code for the Shopping Cart , CART.PHP


<?php


include("menu.php"); 
include("SQL2.php"); 

?>

<script language="JavaScript">

function UpdateQty(item)
{
productid = product.name;
newQty = product.options[product.selectedIndex].text;

document.location.href = 'cart.php?action=update_item&id='+productid+'&qty='+newQty;
}

</script>

<?php
switch($_GET["action"])
{
case "add_item":
{
	AddItem($_GET["id"], $_GET["qty"]);
	ShowCart();
	break;
}

case "update_item":
{
	UpdateItem($_GET["id"], $_GET["qty"]);
	ShowCart();
	break;
}

case "remove_item":
{
	RemoveItem($_GET["id"]);
	ShowCart();
	break;
}

default:
{
	ShowCart();
}
} 

function AddItem($itemid, $qty)
{
	$result = mysql_query("select count(*) from cart where cookieid = '" . GetCartId() . "' and productid = $productid");

	$row = mysql_fetch_row($result);
	$numRows = $row[0];

	if($numRows == 0)
	{
	// This item doesn't exist in the users cart,
	// we will add it with an insert query

	mysql_query("INSERT INTO cart(cookieid, productid, qty) values('" . GetCartId() . "', $productid, $qty)");
	}
	else
	{
	// This item already exists in the users cart,
	// we will update it instead

	UpdateItem($productid, $qty);
	}
}

function UpdateItem($productid, $qty)
{
mysql_query("UPDATE cart set qty = $qty where cookieid = '" . GetCartId() . "' and productid = $productid");	
}

function RemoveItem($productid)
{
mysql_query("DELETE from cart where cookieId = '" . GetCartId() . "' and productid = $productid");
}

function ShowCart()
{
$result = mysql_query("select * from cart inner join product on cart.productid = product.productid where cart.cookieId = '" . GetCartId() . "' order by product.name asc");



while($row = mysql_fetch_array($result))
{
// Increment the total cost of all items
$totalCost += ($row["qty"] * $row["price"]);
?>
<html>
<head></head>
<body>
<table>
<tr>
<td width="15%" height="25">
<font face="verdana" size="1" color="black">
<select name="<?php echo $row["productid"]; ?>" onChange="UpdateQty(this)">

<?php

for($i = 1; $i <= 5; $i++)
{
	echo "<option ";
	if($row["qty"] == $i)
	{
		echo " SELECTED ";
	}
	echo ">" . $i . "</option>";
}
?>

</select>

</font>
</td>

<td width="55%" height="25">
<font face="verdana" size="1" color="black">
<?php echo $row["name"]; ?>
</font>
</td>
<td width="20%" height="25">
<font face="verdana" size="1" color="black">
$<?php echo number_format($row["price"], 2, ".", ","); ?>
</font>
</td>
<td width="10%" height="25">
<font face="verdana" size="1" color="black">
<a href="cart.php?action=remove_item&id=<?php echo $row["productid"]; ?>">Remove</a>
</font>
</td>
</tr>

<tr>
<td width="100%" colspan="4">
<hr size="1" color="red" NOSHADE>
</td>
</tr>
<tr>
<td width="70%" colspan="2">
<font face="verdana" size="1" color="black">
<a href="home.php"><< Keep Shopping</a>
</font>
</td>
<td width="30%" colspan="2">
<font face="verdana" size="2" color="black">
<b>Total: <?php echo number_format($totalCost, 2, ".", ","); ?> </b>
</font>
</td>
</tr>
</table>
</body>
</html>
<?php
}
}
?>

Code for a Sample Item which can be added to the Cart


<?php


include("menu.php"); 
include("SQL2.php"); 

$sql = mysql_query("SELECT * FROM product WHERE productid = '1'")
or die(mysql_error());
$rows=mysql_fetch_array($sql);

?>

<html>

<head>
<title>Core 2 Duo</title>
<link rel="stylesheet" href="styler.css">
</head>

<body>
<br><br><br>

<table border="0" width="87%" cellspacing="1" id="table1">
<tr>
	<td rowspan="6">
	<img src="http://www.webuildsolutions.com/images/products/intel-core2duo-lga775-box.jpg"></td>
	<td width="398" colspan="2">Intel Core 2 Duo E6300</td>
</tr>
<tr>
	<td width="398" colspan="2"> </td>
</tr>
<tr>
	<td width="118">Clock Speed</td>
	<td width="277"> 3.72 GHz  ( 2 X 1.86 GHz)</td>
</tr>
<tr>
	<td width="118">Bus Speed</td>
	<td width="277">1066 MHz</td>
</tr>
<tr>
	<td width="118">L2 Cache</td>
	<td width="277">2 MB </td>
</tr>
<tr>
	<td width="118">Features</td>
	<td width="277">Enhanced Speedstep Technology<br>Intel Extended Memory 
	64 Technology<br>Intel Virtualization Technology<br>Intel ViiV 
	Technology</td>
</tr>
<tr>
	<td>
	<p align="center">         
	<i><p align="center"><? echo $rows['stock']; ?> in Stock   </i>      
	<p align="center">£ <? echo $rows['price']; ?> inc. VAT   
	<a href ="cart.php?action=add_item@id=<?php echo $rows["productid"]; ?> &qty=1" > <img src = "add.jpg"> </a>
	</td>
	<td width="118">Warranty</td>
	<td width="277">3 Years</td>
</tr>
</table>
<br><br><br>	
<?php include("base.php"); ?>
</body>

</html>

Help is needed urgently. please help me out guys.

redarrow · May 1, 2007

stick this on top of the page with the error

<?php
ob_start();
session_start(); //if session needed.


ob_flush(); // end of page.
?>

ob_start(); is not a good solution but will work ok.

url

http://uk3.php.net/ob_start

OilSheikh · May 1, 2007

One went away cos I decided to remove session( ) from within the code.

Another remains.


Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\menu.php: in C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\SQL2.php on line 16

SQL2.PHP now looks like


<?php
ob_start();

  	mysql_connect ("localhost", "root" , "zforce") or die (mysql_error());
mysql_select_db("express") or die (mysql_error());

function GetCartId()
{
if (isset($_COOKIE["cartid"]) )
{
	return $_COOKIE["cartid"];
}
else
{

	setcookie("cartid",session_id(),time()+((3600*24)*2) );
	return session_id();
}
}
ob_flush();
?>

OilSheikh · May 1, 2007

???

OilSheikh · May 6, 2007

Can NO-ONE HELP ME? :'(

MadTechie · May 6, 2007

post the menu script please

first 10lines should be ok

chronister · May 6, 2007

You are trying to modify headers after the output has started. The output is starting on line 8 of menu.php. Take a look at the lines above it.

Line 16 is the setcookie line. Menu.php is where the output is at to cause the error.

OilSheikh · May 13, 2007

Sorry about the late reply guys .. Damn flu kept me occupied.

This is the latest only error that I get

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\cart.php:4) in C:\Program Files\ZSOFT\XAMPP\xampp\htdocs\SQL2.php on line 16

SQL2.PHP


<?php
ob_start();

  	mysql_connect ("localhost", "root" , "zforce") or die (mysql_error());
mysql_select_db("express") or die (mysql_error());

function GetCartId()
{
if (isset($_COOKIE["cartid"]) )
{
	return $_COOKIE["cartid"];
}
else
{

	setcookie("cartid",session_id(),time()+((3600*24)*2) );
	return session_id();
}
}
ob_flush();
?>

Sign In

eeeeeeeek.... Session Clashes!

Recommended Posts

OilSheikh

Link to comment

Share on other sites

redarrow

Link to comment

Share on other sites

OilSheikh

Link to comment

Share on other sites

OilSheikh

Link to comment

Share on other sites

OilSheikh

Link to comment

Share on other sites

MadTechie

Link to comment

Share on other sites

chronister

Link to comment

Share on other sites

OilSheikh

Link to comment

Share on other sites

Join the conversation

Browse

Activity

Important Information