Cannot modify header information

KeithLantern · September 5, 2016

I keep getting this error Warning: Cannot modify header information - headers already sent by (output started at /home2/orangejuicea/public_html/coffeetable/logout.php:3) in /home2/orangejuicea/public_html/coffeetable/helpers/system_helper.php on line 24

I believe that something is wrong between tehse two files. Is there anyone who can help me. Any advice you would give would be greatly appreciated.

SYSTEM_HELPER.PHP
<?php
/*
* Redirect To Page
*/
function redirect($page = FALSE, $message = NULL, $message_type = NULL) {
   if (is_string ($page)) {
       $location = $page;
   } else {
       $location = $_SERVER ['SCRIPT_NAME'];
   }

   //Check For Message
   if($message != NULL){
       //Set Message
       $_SESSION['message'] = $message;
   }
   //Check For Type
   if($message_type != NULL){
       //Set Message Type
       $_SESSION['message_type'] = $message_type;
   }

   //Redirect
   header ('Location: '.$location);
   exit;
}

/*
* Display Message
*/
function displayMessage(){
   if(!empty($_SESSION['message'])) {

       //Assign Message Var
       $message = $_SESSION['message'];

       if(!empty($_SESSION['message_type'])) {
           //Assign Type Var
           $message_type = $_SESSION['message_type'];
           //Create Output
           if ($message_type == 'error') {
               echo '<div class="alert alert-danger">' . $message . '</div>';
           } else {
               echo '<div class="alert alert-success">' . $message . '</div>';
           }
       }
       //Unset Message
       unset($_SESSION['message'] );
       unset($_SESSION['message_type'] );
   } else {
       echo '';
   }
}

/*
* Check If User Is Logged In
*/
function isLoggedIn(){
   if(isset($_SESSION['is_logged_in'])){
       return true;
   } else {
       return false;
   }
}

/*
* Get Logged In User Info
*/
function getUser(){
   $userArray = array();
   $userArray['user_id'] = $_SESSION['user_id'];
   $userArray['username'] = $_SESSION['username'];
   $userArray['name'] = $_SESSION['name'];
   return $userArray;
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
HEADER.PHP
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Welcome To The Coffee Table</title>

   
    <link href="<?php echo BASE_URI; ?>templates/css/bootstrap.css" rel="stylesheet">
    
    <link href="<?php echo BASE_URI; ?>templates/css/custom.css" rel="stylesheet">
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <script src="<?php echo BASE_URI; ?>templates/js/bootstrap.js"></script>
   <script src="<?php echo BASE_URI; ?>templates/js/ckeditor/ckeditor.js"></script>
   <?php
    //Check if title is set, if not assign it
    if(!isset($title)){
       $title = SITE_TITLE;
    }
    ?>
</head>

<body>

    <div class="navbar navbar-inverse navbar-fixed-top" role="navigation">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="index.php">The Coffee Table</a>
        </div>
        <div class="collapse navbar-collapse">
          <ul class="nav navbar-nav navbar-right">
            <li class="active"><a href="index.php">Home</a></li>
           <?php if(!isLoggedIn()) : ?>
               <li><a href="register.php">Create An Account</a></li>
           <?php else : ?>
               <li><a href="create.php">Create Topic</a></li>
           <?php endif; ?>
          </ul>
        </div>
      </div>
    </div>

    <div class="container">
       <div class="row">
           <div class="col-md-8">
               <div class="main-col">
                   <div class="block">
                       <h1 class="pull-left"><?php echo $title; ?></h1>
                       <h4 class="pull-right">A simple PHP forum engine</h4>
                       <div class="clearfix"></div>
                       <hr>
                       <?php displayMessage(); ?>

jasonc · September 5, 2016

Hi please can you let us know the content of your logout.php file as this is where the error is, as stated in the error message.

It's likely that there is some output too soon,

QuickOldCar · September 5, 2016

header() must be used before any output is displayed.

I don't see anywhere in your header.php code you posted that SYSTEM_HELPER.PHP is included or your redirect function is being called upon.

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Cannot modify header information

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