warning error message. Cannot modify header information

Discussion in 'PHP' started by mcf1992, Sep 20, 2011.

0
  1. #1
    Warning: Cannot modify header information - headers already sent by (output started at path/development/load/dologin.php:14) in path/development/load/dologin.php on line 33

    <?php session_start();?><html xmlns="http://www.w3.org/1999/xhtml"><head><LINK href="includes/css/style.css" rel="stylesheet" type="text/css"><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Login</title></head><body><div id="header">PaymentINC</div><?phpinclude("dbsettings.php");  mysql_connect("$host", "$username", "$password")or die("cannot connect");   mysql_select_db("$db_name")or die("cannot select DB");     $username = mysql_real_escape_string($_POST['username']);  $password = md5(mysql_real_escape_string($_POST['password']));  
$sql="SELECT * FROM `user` WHERE `username`='{$username}' AND `password`='{$password}'";  $result=mysql_query($sql);     // do the check  if($result)  {      if(mysql_num_rows($result) == 1)      {          $_SESSION['username'] = $username;        $_SESSION['password'] = $password;
        header("location: account.php");              exit();      }      else      {        echo "Wrong username/password.";      }  }  else  {      echo "The query is not true.";  }  ?>
    PHP:
     
    mcf1992, Sep 20, 2011 IP
  2. Rising_Star

    Rising_Star Active Member

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    #2
    u can use header() and session_start() only before giving any output through ur page.. in this case session_start is fine but u can't use header()
     
    Rising_Star, Sep 21, 2011 IP
    jevchance likes this.
  3. jevchance

    jevchance Peon

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    #3
    Move all of your code into the first PHP block. Instead of directly echoing, save your response text to a variable. Then, in the page, just echo the variable.
     
    jevchance, Sep 21, 2011 IP
  4. patrick.s

    patrick.s Greenhorn

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    #4 
    <?php session_start();?><?php
include("dbsettings.php"); 
mysql_connect("$host", "$username", "$password")or die("cannot connect");   
mysql_select_db("$db_name")or die("cannot select DB");     
$username = mysql_real_escape_string($_POST['username']);  
$password = md5(mysql_real_escape_string($_POST['password']));  
$sql="SELECT * FROM `user` WHERE `username`='{$username}' AND `password`='{$password}'";  
$result=mysql_query($sql);     // do the check  if($result)  
{      
if(mysql_num_rows($result) == 1)      
{          
$_SESSION['username'] = $username;        
$_SESSION['password'] = $password;
header("location: account.php");              
exit();      
}      else      {        
echo "Wrong username/password.";      
}  
}  else  {      
echo "The query is not true.";  
}  
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<LINK href="includes/css/style.css" rel="stylesheet" type="text/css">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Login</title>
</head>
<body>
<div id="header">PaymentINC</div>
    Code (markup):
    What do you get when you use that?
     
    patrick.s, Sep 21, 2011 IP
  5. webshore88

    webshore88 Well-Known Member

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    #5
    you should separate html and php codes in separate files. Then include html into the php. Suggestion: use header() before any header manipulation, so include('html') after header().
     
    Last edited: Sep 21, 2011
    webshore88, Sep 21, 2011 IP