PHP error message again

182x · June 14, 2007

Hey guys,

I installed Xampp yesterday and I am still getting the following error message with the PHP code which I did not have before I installed xampp so i was just wondering why i am getting this error now? I also have the session_start at the top of the code.

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\xampp\htdocs\test\processUpload.php:4)

Thanks

ToonMariner · June 14, 2007

on line 4 of that script you either have an echo or print statement or you have broken out of php and begun ouputting html OR just plain old white space.

182x · June 14, 2007

Hi, I can't seem to find the problem, can you see it in the code? Sorry about the tabs they messed up when i copied the code.

<html>
<head>
<title>pu</title>
<style type="text/css">
<!--
.style1{font-family: Arial, Helvetica, sans-serif}
-->
</style>
</head>
<body bgcolor="#CCCCCC">
<p align="center" style="style1">

<?php
session_start();
include('db.php');
$link_id = db_('');


$fl = "uw/";


$fl = $fl.$HTTP_POST_FILES['gf']['na'];

$mn= $HTTP_POST_VARS['mn'];
$pa = $fl;
$an = $HTTP_POST_VARS['an'];
$at = $HTTP_POST_VARS['at'];


if(move_uploaded_file($HTTP_POST_FILES['gf']['tn'], $fl))
  	{
    	
	$gu = "SELECT ui FROM up WHERE pa = '$fl'";
	$re = mysql_query($gu, $link_id);

		if(mysql_num_rows($re) > 0 )
		{
?>
			<p align="center" class="style1">
                               <?php echo "already exists"; ?>


			</p>
			 <p align="center" class="style1"><a href="uw.php" class="style6">Back </a></span></p>
			 <p align="center" class="style1"><a href="lo.php" class="style6">Logout</a></span></p>
<?php
			exit();

		}

	$iu="INSERT INTO upload VALUES('','$mn','$pa', '$an', '$at')";
	mysql_query($iu, $link_id);
?>

	<p align="center" class="style1">
          	<?php echo "The selected file ".$HTTP_POST_FILES['gf']['na']. "";?> </p>

<?php
		 }
  	 			else
     	 				{
?>
	  		 <p align="center" class="style1">
			<?php echo "the file does not exist.";?>
			</p>
			 <p align="center" class="style1"><a href="uw.php" class="style1">Back </a></span></p>
			 <p align="center" class="style1"><a href="lo.php" class="style1">Logout</a></span></p>
<?php
			exit();
     	 				}
?>


</p>

  <p align="center" class="style1">Please click the following:</p>
  <p align="center" class="style1"><a href="ah.php">Home</a></p>
   <p align="center" class="style1"><a href="lo.php">Logout</a></p>

</body>
</html>

conker87 · June 14, 2007

You need to start the session before anything else is sent. Once you close the <head> tag (or echo something) then the headers have been sent.

<?php

session_start();
include('db.php');
$link_id = db_('');

?><html>
<head>
<title>pu</title>
<style type="text/css">
<!--
.style1{font-family: Arial, Helvetica, sans-serif}
-->
</style>
</head>
<body bgcolor="#CCCCCC">
<p align="center" style="style1">

<?php

$fl = "uw/";


$fl = $fl.$HTTP_POST_FILES['gf']['na'];

$mn= $HTTP_POST_VARS['mn'];
$pa = $fl;
$an = $HTTP_POST_VARS['an'];
$at = $HTTP_POST_VARS['at'];


if(move_uploaded_file($HTTP_POST_FILES['gf']['tn'], $fl))
  	{
    	
	$gu = "SELECT ui FROM up WHERE pa = '$fl'";
	$re = mysql_query($gu, $link_id);

		if(mysql_num_rows($re) > 0 )
		{
?>
			<p align="center" class="style1">
                               <?php echo "already exists"; ?>


			</p>
			 <p align="center" class="style1"><a href="uw.php" class="style6">Back </a></span></p>
			 <p align="center" class="style1"><a href="lo.php" class="style6">Logout</a></span></p>
<?php
			exit();

		}

	$iu="INSERT INTO upload VALUES('','$mn','$pa', '$an', '$at')";
	mysql_query($iu, $link_id);
?>

	<p align="center" class="style1">
          	<?php echo "The selected file ".$HTTP_POST_FILES['gf']['na']. "";?> </p>

<?php
		 }
  	 			else
     	 				{
?>
	  		 <p align="center" class="style1">
			<?php echo "the file does not exist.";?>
			</p>
			 <p align="center" class="style1"><a href="uploadWork.php" class="style1">Back </a></span></p>
			 <p align="center" class="style1"><a href="logout.php" class="style1">Logout</a></span></p>
<?php
			exit();
     	 				}
?>


</p>

  <p align="center" class="style1">Please click the following link to go to back to the admin home page:</p>
  <p align="center" class="style1"><a href="adminHome.php">Home</a></p>
   <p align="center" class="style1"><a href="logout.php">Logout</a></p>

</body>
</html>

182x · June 14, 2007

Ahh I see. Thanks so much for your help!

The previous version of PHP I was using was PHP4 and Xampp uses PHP5 does the session_start() rule not apply for PHP4?

wildteen88 · June 14, 2007

Yes it applies to all versions of PHP. You probably didn't see that error last time because your PHP4 setup had display_errors set to off so you didn't see the error - however you would of gotten a blank page instead. Or your PHP4 setup had output buffering enabled in the php.ini

182x · June 14, 2007

Yes it applies to all versions of PHP. You probably didn't see that error last time because your PHP4 setup had display_errors set to off so you didn't see the error - however you would of gotten a blank page instead. Or your PHP4 setup had output buffering enabled in the php.ini

Thanks again

Am I best having output buffering enabled in the php.ini file? and is it also good practice to put the following code at the top of all the pages to avoid problems?

<?php session_start(); ?>

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