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[SOLVED] error when dealing with session

sungpeng

By sungpeng
in PHP Coding Help

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sungpeng Regular Member

sungpeng

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Posted

hi check I keep having this error when dealing with session

 

Warning session_start()[function.session-start]: Cannot send session cookie - headers already sent by (output started at /home2/example/public_html/house/test2.php.

 

Can anyone please help explain?

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sungpeng Regular Member

sungpeng

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accesscontrol.php

<?php 
include ("".$_SERVER['DOCUMENT_ROOT']."/housing/includes/config.php");

session_start();

if (isset($_POST['uid'])) {
$uid = $_POST['uid'];
} else {
$uid = $_SESSION['uid'];
}
if (isset($_POST['pwd'])) {
$pwd = md5($_POST['pwd']);
} else {
$pwd = $_SESSION['pwd'];
}


if(!isset($uid) || !isset($pwd) )
{
  ?>
  <html>
  <head>
  <title> Please Log In for Access </title>
  </head>
<body>
  <table align=center width=300 border=0 cellspacing=0 cellpadding=0 bgcolor="#2f4f4f">
  <tr><td>
   <table border=0 width=100% cellspacing=1 cellpadding=1>
    <form action="<?=$_SERVER['PHP_SELF']?>" method=POST>
    <tr><td BGCOLOR="#2f4f4f"><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif" COLOR="#FFFFFF">
    <B>Please Log In For Access:</B>
    </td></tr>
    <tr><td BGCOLOR="#c7c7c7"><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif">
You must log in to access this area of the site.
     </td></tr>
    <tr>
     <td BGCOLOR="#fffff0">
      <table width=100% border=0 cellspacing=0 cellpadding=0>
    <tr>
     <td><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif">Email Address:</td>
     <td><input type=text name="uid" size="20" value=""></td>
    </tr>
        <tr>
     <td><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif">Password:</td>
     <td><input type=password name="pwd" size="20"></td>
    </tr>
    <tr>
     <td colspan=2 align=center>
      <input type=submit name="Login" value="Login">
     </td>
    </tr>
    </form>
      </table>
     </td>
    </tr>
   </table>
  </td></tr>
</table>
  </body>
  </html>
  <?php
  exit;
}
//Clean the input submitted to mysql
$uid=addslashes($uid);
$pwd=addslashes($pwd);

//this puts the variable into the session

$_SESSION['uid'] = $uid; 
$_SESSION['pwd'] = $pwd;

$sql = "SELECT * FROM users WHERE email = '$uid' AND passwd = '$pwd' ";

$result = mysql_query($sql);

if (!$result) {
echo "A database error occurred while checking your login details";
}
//if bad user/pass combo access denied
if (mysql_num_rows($result) == 0) {

  unset($_SESSION['uid']);
  unset($_SESSION['pwd']);
  ?>
  <html>
  <head>
  <title> Access Denied </title>
  </head>
  <body>
  <h1> Access Denied </h1>
  <p>There are several reasons this may be happening:<BR>
  <UL><LI>Your username or password is incorrect</LI>
  <LI>You have forgotten your login information. <a href="password_reset.php">Lost Password</a></LI></UL>
  To return to our login page, <a href="index.php">click here</a>.</p>
  </body>
  </html>
    <?php
  exit;
}

?>

 

 

 

test2.php




<?php 

if($_POST[action]=="Update")
{

echo "hello";

    
}

?>

<html>

<title>Upload an image to a database</title>


<body>


<h2>Update with new information</h2>
<form name="form" enctype="multipart/form-data" method="post" action="<?php echo"$PHP_SELF?rid=$_GET[rid]"; ?>">
<?php 
include ("".$_SERVER['DOCUMENT_ROOT']."/housing/accesscontrol.php");
?>
<input type=text name='images' class='bginput'>


<input type="submit" name="action" value="Update">
</form>

</body>
</html>

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kenrbnsn Regular Member

kenrbnsn

Posted
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The session_start() MUST be called before any output is sent to the browser. In your case make sure there is no white space (or blank lines) before the first "<?php" in test2.php and then put the session_start() right after the "<?php". Remove it from accesscontrol.php

 

Ken

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sungpeng Regular Member

sungpeng

Posted
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Posted

housing accesscontrol.php

<?php 
include ("".$_SERVER['DOCUMENT_ROOT']."/housing/includes/config.php");

session_start();

if (isset($_POST['uid'])) {
$uid = $_POST['uid'];
} else {
$uid = $_SESSION['uid'];
}
if (isset($_POST['pwd'])) {
$pwd = md5($_POST['pwd']);
} else {
$pwd = $_SESSION['pwd'];
}


if(!isset($uid) || !isset($pwd) )
{
  ?>
  <html>
  <head>
  <title> Please Log In for Access </title>
  </head>
<body>
  <table align=center width=300 border=0 cellspacing=0 cellpadding=0 bgcolor="#2f4f4f">
  <tr><td>
   <table border=0 width=100% cellspacing=1 cellpadding=1>
    <form action="<?=$_SERVER['PHP_SELF']?>" method=POST>
    <tr><td BGCOLOR="#2f4f4f"><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif" COLOR="#FFFFFF">
    <B>Please Log In For Access:</B>
    </td></tr>
    <tr><td BGCOLOR="#c7c7c7"><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif">
You must log in to access this area of the site.
     </td></tr>
    <tr>
     <td BGCOLOR="#fffff0">
      <table width=100% border=0 cellspacing=0 cellpadding=0>
    <tr>
     <td><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif">Email Address:</td>
     <td><input type=text name="uid" size="20" value=""></td>
    </tr>
        <tr>
     <td><FONT SIZE="-1" FACE="Verdana,Tahoma,Arial,Helvetica,sans-serif">Password:</td>
     <td><input type=password name="pwd" size="20"></td>
    </tr>
    <tr>
     <td colspan=2 align=center>
      <input type=submit name="Login" value="Login">
     </td>
    </tr>
    </form>
      </table>
     </td>
    </tr>
   </table>
  </td></tr>
</table>
  </body>
  </html>
  <?php
  exit;
}
//Clean the input submitted to mysql
$uid=addslashes($uid);
$pwd=addslashes($pwd);

//this puts the variable into the session

$_SESSION['uid'] = $uid; 
$_SESSION['pwd'] = $pwd;

$sql = "SELECT * FROM users WHERE email = '$uid' AND passwd = '$pwd' ";

$result = mysql_query($sql);

if (!$result) {
echo "A database error occurred while checking your login details";
}
//if bad user/pass combo access denied
if (mysql_num_rows($result) == 0) {

  unset($_SESSION['uid']);
  unset($_SESSION['pwd']);
  ?>
  <html>
  <head>
  <title> Access Denied </title>
  </head>
  <body>
  <h1> Access Denied </h1>
  <p>There are several reasons this may be happening:<BR>
  <UL><LI>Your username or password is incorrect</LI>
  <LI>You have forgotten your login information. <a href="password_reset.php">Lost Password</a></LI></UL>
  To return to our login page, <a href="index.php">click here</a>.</p>
  </body>
  </html>
    <?php
  exit;
}

?>

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Brian W Regular Member

Brian W

Posted
Posted

You can't because you already  have "output". Once any html, plain text, or even white-space/line-breaks has been output, you cannot declare session_start(). I'd suggest removing it from accesscontrol.php and simply placing it at the top of test2.php . That should alleviate the problem, but remember that all pages that are using accesscontrol.php will need session_start() declared.

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