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Warning: session_start(): Cannot send session cache limiter - headers already sent

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Warning: session_start(): Cannot send session cache limiter - headers already sent

 
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  #1
Jun 1st, 2006
Whenever i run session in server than it show this problem

Warning: session_start(): Cannot send session cache limiter - headers already sent

so pls help me

this is simple login prog when user enter into nxt page it name will show i want to store its name in session

i m giving full code wht i m using if thr is anything wrong pls tell me

<? @session_start();?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0046)http://acmserver.cs.ucr.edu/~nkumar/vision.htm -->
<HTML>
<HEAD><TITLE>Bankon Us</TITLE>
<META http-equiv=Content-Type content="text/html; charset=utf-8">

<link rel="stylesheet" href="style.css" type="text/css">
<body topmargin="0" leftmargin="0">
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tr>
<TD align=center>
<table cellpadding="0" cellspacing="0" border=0 width="100%">
<tr><td height="25">&nbsp;</td></tr>
<tr>
<td width="50%" align="right">
<?php
$_SESSION['admfname']= $_POST['fname'];
$_SESSION['admlname']= $_POST['lname'];
$_SESSION['admpassword']=$_POST['password'];
if (($_SESSION['admfname'] == "peter") and ($_SESSION['admlname'] == "gewant") and ($_SESSION['admpassword'] == "approvalagent"))
{
//header("Location:admin_page.php");
echo "<meta http-equiv='Refresh' content='0; url=admin_page.php'>";
exit;
}
$f_name= $_POST['fname'];
$l_name= $_POST['lname'];
$pass= $_POST['password'];
if($_POST['submit'] != "Login")
{
?>
<table border="0" cellpadding="5" cellspacing="3" width="80%" class="form-noindent">
<tr><td bgColor="#ff9900">
<form method="post" action="<?php $_SERVER['PHP_SELF']?>">
<input type="hidden" name="agent" value="access">
<table border="0" width="100%">
<tr>
<td colspan="3" align="center" class="heading">Sign in with your<br> Account</td>
</tr>
<tr><td>&nbsp;</td></tr>
<tr>
<td>&nbsp;</td>
<td class="textform">First Name&nbsp;:</td>
<td class="forms" valign="top">
<input name="fname" class="cartForm" size=20 type="text"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td class="textform">Last Name&nbsp;:</td>
<input name="lname" class="cartForm" size=10 type="hidden">
<td class="forms" valign="top">
<input name="lname" class="cartForm" size=20 type="text"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td class="textform">Password&nbsp;:</td>
<td class="forms" valign="top">
<input class="cartForm" name="password" size=20 type="password"></td>
</tr>
<tr>
<td valign="top" colspan="3" align="center">&nbsp;&nbsp;
<input type="submit" name="submit" value="Login" class="cartForm" >
</td>
</tr>
<tr><td colspan="3">&nbsp;</td></tr>
<tr>
<td colspan="2" align="center"><div class="leo"><a href="forget.php">Forget Password</a></div></td>
<td align="center"><div class="leo"><a href="order.php">New user click here</a></div></td>
</tr>
</table>
</form>
</td></tr>
</table>
</td>
<td width="50%" align="center"><img src="images/online.jpg"></td>
</tr>
</table>
<br><br>
<?php }
elseif($f_name== "" or $l_name== "" or $pass== "")
{
?>
<table border="0" cellpadding="5" cellspacing="3" width="80%" class="form-noindent">
<tr><td bgcolor="#00CC99">
<form method="post" action="<?php $_SERVER['PHP_SELF'] ?>">
<input type="hidden" name="agent" value="access">
<table border="0" width="100%">
<tr>
<td colspan="3" align="center" class="heading">Sign in with your Account</td>
</tr>
<tr><td>&nbsp;</td></tr>
<tr><td colspan="3" align="center" class="heading">Please fill all the fields</td></tr>
<tr><td>&nbsp;</td></tr>
<tr>
<td>&nbsp;</td>
<td class="textform">First Name&nbsp;:</td>
<td class="forms" valign="top">
<input name="fname" class="cartForm" size=20 type="text"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td class="textform">Last Name&nbsp;:</td>
<input name="lname" class="cartForm" size=10 type="hidden">
<td class="forms" valign="top">
<input name="lname" class="cartForm" size=20 type="text"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td class="textform">Password&nbsp;:</td>
<td class="forms" valign="top">
<input class="cartForm" name="password" size=20 type="password"></td>
</tr>
<tr>
<td valign="top" colspan="3" align="center">&nbsp;&nbsp;
<input type="submit" name="submit" value="Login" class="cartForm" >
</td>
</tr>
<tr><td colspan="3">&nbsp;</td></tr>
<tr>
<td colspan="2" align="center"><div class="leo"><a href="forget.php">Forget Password</a></div></td>
<td align="center"><div class="leo"><a href="order.php">New user click here</a></div></td>
</tr>
</table>
</form>
</td></tr>
</table>
</td>
<td width="50%" align="center"><img src="images/login1.jpg" width="300" height="200"></td>
</tr>
</table>
<?php
}
else {
$query = "SELECT * from users WHERE firstname='$f_name' and lastname='$l_name' and password='$pass' ";
$result = mysql_query($query);
for ($i = 0; $i < mysql_num_rows($result); $i++)
{
$id = mysql_result($result, $i, "id");
$fname = mysql_result($result, $i, "firstname");
$lname = mysql_result($result, $i, "lastname");
$pas = mysql_result($result, $i, "password");
if (("$f_name" == "$fname") and ("$l_name" == "$lname") and ("$pass" == "$pas"))
{
$_SESSION['sfname'] = $f_name;
$_SESSION['slname'] = $l_name;
echo "<meta http-equiv='Refresh' content='0; url=user_page.php'>";
exit;
}//if loop
}//for loop
echo "<meta http-equiv='Refresh' content='0; url=new_user.php'>";
//header("Location:new_user.php");
exit;
}
?>
</td>
</tr>
</table>
</BODY>
</HTML>
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Re: Warning: session_start(): Cannot send session cache limiter - headers already sent

 
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  #2
Jun 1st, 2006
Headers already sent refers to HTTP Headers.
The server cannot send any more http headers if the HTTP Content has started sending.
In PHP code, this means you have ouput something to the page with echo or print etc.

PHP will not output any whitespace in between php tags, However, for anything outside php tags, (eg: html) whitespaces, linebreaks are sent as HTTP Content.
Sometimes this your editor may add whitespace also.

To prevent whitespace from being sent before you send all your headers, make sure the <?php is right at the top of the php script, and there are no lines or white space in between.

You can also use output buffering, ob_start() to buffer your PHP output before sending it to HTTP. Then use ob_flush() to send http output when you need.
see: http://www.php.net/manual/en/function.ob-start.php

I noticed you have //header("Location:admin_page.php"); in your page. You can use the output buffering to allow you to send this header even after you have echo and html output in your php.
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Re: Warning: session_start(): Cannot send session cache limiter - headers already sent

 
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Jun 11th, 2006
You have blank lines in your HTML code, remove them and try again.
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Re: Warning: session_start(): Cannot send session cache limiter - headers already sen

 
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  #4
Jun 18th, 2006
Works fine for me. Attached is the code I copied and pasted, so you have at least a file that worked.

My test was done with EasyPHP, with the PHP version upgraded to 5.04.
Attached Files
File Type: php someguyscode.php (5.0 KB, 42 views)
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Re: Warning: session_start(): Cannot send session cache limiter - headers already sent

 
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  #5
Jun 18th, 2006
Pass the header before any HTML tags or else it would show errors

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Re: Warning: session_start(): Cannot send session cache limiter - headers already sent

 
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  #6
Sep 1st, 2008
Use This Php Script at top of the your php page this script start session before dowload include file i hope you will solve this problem.
<URL SNIPPED>

php Syntax (Toggle Plain Text) 
  1. <?php 
  2. if (!isset($_SESSION)) {
  3.   session_start();
  4. }
  5. ?>
Last edited by peter_budo; Sep 2nd, 2008 at 7:41 am. Reason: Keep It Spam-Free - Do not spam, advertise, plug your website, or engage in any other type of self promotion.
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Re: Warning: session_start(): Cannot send session cache limiter - headers already sent

 
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  #7
Sep 2nd, 2008
this error will occur at the times of:

1.any space is there before the session_start(); function..Means it sholu be the first line of your application...
2.dont use session_start(); as twice (in your main application and in your included application)
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Re: Warning: session_start(): Cannot send session cache limiter - headers already sent

 
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Aug 14th, 2009
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/leadtwot/public_html/staging/contact_us.php:1) in /home/leadtwot/public_html/staging/contact_us.php on line 1
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