Header error

[Worqy]

Hi.

I get a error message from this code:

Error:

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\Game\S1\checkbuild.php:12) in C:\xampp\htdocs\Game\S1\checkbuild.php  on line 50

 

Code:

<?php
Session_start();
if($_SESSION['LoginS1'] == false) 
{
header('Location:login.php');
}
else
{
$fieldid = $_SESSION['fieldID'];
// Check is player has enought resources
$field = "field" . $fieldid;
echo "Field ID " . $fieldid;
echo "<br>";
$level = $_SESSION['level'];
$nextlevel = $level + 1;
// Include
include 'buildings.config.php';
// Connect to server and select database
$connect = mysql_connect("$host","$username","$password")or die("cannot connect");
mysql_select_db("s1-prices")or die("cannot select Database");
$sql = mysql_query("SELECT * FROM $field WHERE level='$nextlevel'") or die(mysql_error());
while($data = mysql_fetch_array( $sql ))
{
	$three = $data['three'];
	$clay = $data['clay'];
	$iron = $data['iron'];
	$wheat = $data['wheat'];
	echo "Next level: ";
	echo "<b>" . $nextlevel . "</b> ";
	echo "<br>";
	echo "Price for level " . $nextlevel;
	echo $three .  " ";
	echo $clay . " ";
	echo $iron . " ";
	echo $wheat . " ";
}
$villageID = $_SESSION['villageID'];
mysql_close($connect);
$connect2 = mysql_connect("$host","$username","$password")or die("cannot connect");
mysql_select_db("s1-overall")or die("cannot select Database");
$sql2 = mysql_query("SELECT * FROM resources") or die(mysql_error());
while($data2 = mysql_fetch_array( $sql2 ))
{
	if($data2['three']  > $three && $data2['clay'] >  $clay && $data2['iron']  > $iron && $data2['clay']  > $clay) 
	{
		//Build
	}
	else
	{
	header('Location:build.php');
	}

}
}
?>

 

 

[Lukeidiot]

http://www.phpfreaks.com/forums/index.php/topic,37442.0.html

[jmajeremy]

The header information always has to be sent to the client before anything else. You can't echo() things to the client, and then redirect them. You could theoretically get around this by using output buffering, but I would seriously reconsider my logic, since there should be no need to output text to the browser before header information.