Help me with this wwarning "Warning:session_start()"

**co.ador** · Nov 8, 2009, 12:25

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home3/nyhungry/public_html/includes/header.php:7) in /home3/nyhungry/public_html/includes/header.php on line 57

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home3/nyhungry/public_html/includes/header.php:7) in /home3/nyhungry/public_html/includes/header.php on line 57
( Hungers)

Code:

<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link type="text/css" href="stylesheets/webpageprueba.css" rel="stylesheet" media="all" />
<title>www.Nyhungry.com</title>
<script type="text/javascript" src="scripts/prototype.js"></script>
<script type="text/javascript" src="scripts/rating.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script type="text/javascript">
(
function()
{
  var default_image = $('td.largethumb img').attr('src');
  $('table.smallthumbs a').mouseover(function() { $('td.largethumb img').attr('src', $('img', this).attr('src')); });
});
</script>
</head>


<body>



<div id="sidebar1">
<ul id="mainNav">
      <li id="home"><a href="restaurants/index.php" title="All restaurants inside nyhungry" class="first">Home</a></li>
                <li id="music"><a href="../../Take Outs/Take Outs frontpage.html" title="Information about all take Outs">Hungry for Music!</a></li>
              <li id="pizzerias"><a href="../../Pizzeria/Pizzeria frontpage.html" title="All the pizzerias inside nyhungry">Contact us</a></li>
                   </ul>
<!-- end #sidebar1 --></div>
<!--<table id="restaurantview">

<a href=""><td width="40" id="contenido1">tropiezo></td></a>
<a href=""><td width="40" id="contenido2">colozar1></td></a>
<a href=""><td width="40" id="contenido3">colozar2></td></a>
<a href=""><td width="40" id="contenido4">colozar3></td></a> 
<a href=""><td width="40" id="contenido4">colozar4></td></a>
<a href=""><td width="40" id="contenido4">colozar3</td></a>
</table>-->

<div id="right">

<?php /*?><?php
 $data=file_get_contents('counter.dat');
 $counter=unserialize($data);
 $counter[$_SERVER["REMOTE_ADDR"]]=time();
 foreach ($counter as $key => $value) if ($value < (time()-180)) unset $counter($k);
 $data=serialize($counter);
 file_put_contents('counter.dat', $data);
 echo'<p>count($counter)." viewing"</p>';
?> </div><?php */?>

<?php  
 session_start(); // this is Line 57 where the warning is coming from... 

/* Define how long the maximum amount of time the session can be inactive. */ 
define("MAX_IDLE_TIME", 3); 

function getOnlineUsers(){ 

if ( $directory_handle = opendir( session_save_path() ) ) { 
$count = 0; 
while ( false !== ( $file = readdir( $directory_handle ) ) ) { 
if($file != '.' && $file != '..'){ 
// Comment the 'if(...){' and '}' lines if you get a significant amount of traffic 
if(time()- fileatime(session_save_path() . '\\' . $file) < MAX_IDLE_TIME * 60) { 
$count++; 
} 
} 
closedir($directory_handle); 

return $count; 

} 
}
else { 
return false; 
} 

} 

echo '(' . getOnlineUsers() . ' viewer)<br />'; ?>

</div>

**sheardben** · Nov 8, 2009, 12:36

You need to have session_start() right at the top of the page.

ie. <?php session_start(); ?> THEN <!DOCTYPE... etc

**Force Flow** · Nov 8, 2009, 15:39

In order for a session to be started, no output can be sent to the browser yet. This also means that if you print out PHP error messages before session_start(), you'll get the same error as well.

**SpacePhoenix** · Nov 8, 2009, 17:39

There is nothing wrong with the script as posted, I tried it locally and did not get any errors so possibly something is wrong with the OPs setup. co.ador is the script you posted in a include used by another file, if it is the culprit is most likely in the other file.

**crmalibu** · Nov 8, 2009, 18:05

Originally Posted by SpacePhoenix

There is nothing wrong with the script as posted, I tried it locally and did not get any errors so possibly something is wrong with the OPs setup.

php has a feature which can buffer output for you.
http://www.php.net/manual/en/ref.outcontrol.php

This is probably turned on automatically in your configuration files.

**co.ador** · Nov 8, 2009, 22:35

what is the OPs setup?

Yes the script I have put is included in another file, is that the cause of the problem?

I include that script in another file.

What is the culprit?

Hope this can be solved...

**PHPycho** · Nov 8, 2009, 23:27

Zend Framework utilizes the
<?php
//code goes here

pattern, leaving the (?>) closing tag and its main purpose is to avoid the unecessary space outputs.

**co.ador** · Nov 9, 2009, 05:40

space outputs.

I have downloaded the script and analyzed and i notice the ?> closing tag was missing. i thought they have don't a mistake so i put it back again.

Well now with the ?> closing tags and the script code below this is the error that comes alone.

Notice: Undefined variable: REMOTE_ADDR in C:\wamp\www\nyhungry\includes\header.php on line 62
Useronline Insert Failed >
Notice: Undefined variable: PHP_SELF in C:\wamp\www\nyhungry\includes\header.php on line 74
0 users online
?>

PHP Code:


<?php 
//fill in some basic info
$server = "localhost"; 
$db_user = "root"; 
$db_pass = "trementdo"; 
$database = "colo"; 
$timeoutseconds = 300; 

//get the time
$timestamp = time(); 
$timeout = $timestamp-$timeoutseconds; 

//connect to database
mysql_connect($server, $db_user, $db_pass); 

//insert the values
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','$REMOTE_ADDR'['REMOTE_ADDR'],'$_SERVER'['PHP_SELF']"); 
if(!($insert)) { 
print "Useronline Insert Failed > "; 
} 

//delete values when they leave
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout"); 
if(!($delete)) { 
print "Useronline Delete Failed > "; 
} 

//grab the results
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='$PHP_SELF'"); 
if(!($result)) { 
print "Useronline Select Error > "; 
} 

//number of rows = the number of people online
$user = mysql_num_rows($result); 


//spit out the results
mysql_close(); 
if($user == 1) { 
print("$user Hungry online\n"); 
} else { 
print("$user users online"); 
} 
?>

If you notice i have changed the script a little bit.

**SpacePhoenix** · Nov 9, 2009, 11:57

You've got the ' in the wrong place:

PHP Code:


//insert the values
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','$REMOTE_ADDR'['REMOTE_ADDR'],'$_SERVER'['PHP_SELF']"); 
if(!($insert)) { 
print "Useronline Insert Failed > "; 
}

should be:

PHP Code:


//insert the values
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','$REMOTE_ADDR['REMOTE_ADDR']','$_SERVER['PHP_SELF']'"); 
if(!($insert)) { 
print "Useronline Insert Failed > "; 
}

**co.ador** · Nov 9, 2009, 12:51

When I do it like you last suggested then this parse error come up

Parse error: parse error, expecting `T_STRING' or `T_VARIABLE' or `T_NUM_STRING' in C:\wamp\www\nyhungry\includes\header.php on line 55

Then if I put curly braces then the following erros come alone.

Useronline Insert Failed > Useronline Delete Failed > Useronline Select Error >
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\wamp\www\nyhungry\includes\header.php on line 74

the three requests to the data base fail

The Insert:

PHP Code:


//insert the values

$insert = mysql_query( "INSERT INTO useronline VALUES

('$timestamp','{$_SERVER['REMOTE_ADDR']}','{$_SERVER['PHP_SELF']}'" . mysql_error()); 

if(!($insert)) { 

print "Useronline Insert Failed > " ; 

}

The Delete:

PHP Code:


//delete values when they leave

$delete = mysql_query("DELETE FROM useronline WHERE timestamp<$timeout" . mysql_error()); 

if(!($delete)) { 

print "Useronline Delete Failed > "; 

}

The SELECT:

PHP Code:


//grab the results

$result = mysql_query("SELECT DISTINCT ip FROM useronline WHERE file='{$_SERVER['PHP_SELF']}'" . mysql_error()); 

if(!($result)) { 

print "Useronline Select Error > "; 

}

and as a result of not connection then mysql_num_rows fail too.

PHP Code:


//number of rows = the number of people online

$user = mysql_num_rows($result);

The error as I stated above is

Useronline Insert Failed > Useronline Delete Failed > Useronline Select Error >
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\wamp\www\nyhungry\includes\header.php on line 74

The connection i think is ok...

The connection i have set up goes as follows

it stars with including constant.php in connection.php

constant.php

PHP Code:


<?php



// Database Constants

defined('DB_SERVER') ? null : define("DB_SERVER", "localhost");

defined('DB_USER')   ? null : define("DB_USER", "username");

defined('DB_PASS')   ? null : define("DB_PASS", "pass");

defined('DB_NAME')   ? null : define("DB_NAME", "colo");



?>



then in connection.php include constant.php. Inside connection.php I work the function mysql_connect



Connection.php

[code] <?php require("constant.php");

 $connection = mysql_connect(DB_SERVER,DB_USER,DB_PASS);

if(!$connection){

die("Database connection failed:" . mysql_error());

}

Then the mysql_select_db function

PHP Code:


mysql_set_charset('utf8',$connection);

$db_select = mysql_select_db(DB_NAME, $connection);

if(!$db_select){

die("Database selection failed: " . mysql_error());

}

and finally the mysql_query functions which are three

PHP Code:


$insert = mysql_query( "INSERT INTO useronline VALUES

('$timestamp','{$_SERVER['REMOTE_ADDR']}','{$_SERVER['PHP_SELF']}'" . mysql_error()); 

if(!($insert)) { 

print "Useronline Insert Failed > " ; 

} 





//delete values when they leave

$delete = mysql_query("DELETE FROM useronline WHERE timestamp<$timeout" . mysql_error()); 

if(!($delete)) { 

print "Useronline Delete Failed > "; 

} 



//grab the results

$result = mysql_query("SELECT DISTINCT ip FROM useronline WHERE file='{$_SERVER['PHP_SELF']}'" . mysql_error()); 

if(!($result)) { 

print "Useronline Select Error > "; 

}

Help please....

is the connection alright?

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