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Problem with my code

chris17

By chris17
in PHP Coding Help

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chris17 Newbie

chris17

Posted
Posted

 Please the when ever i open signin.php which is the second code I get an error as a result "if($_SESSION['signed_in'])
{
echo 'Hello' . $_SESSION['user_name'] . '. Not you? <a href="signout.php">Sign out</a>';
} " in the first code saying that the variable _SESSION is undefined. Please what can i do about this?

//header.php
<!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" />
<meta name="description" content="A short Description." />
<meta name="keywords" content="put, keywords, here" />
<link rel="stylesheet" href="style.css" type="text/css" />
<title>PHP-MySQL Forum</title>
</head>

<body>

<div id="wrapper">
<div id = "menu"> 
<a class="item" href="index.php">Index</a>
<a class="item" href="create_topic.php">Create Topic</a>
<a class="item" href="create_cat.php">Create Category</a>


<?php  
echo '<div id="userbar">';  
    if($_SESSION['signed_in'])  
    {  
        echo 'Hello' . $_SESSION['user_name'] . '. Not you? <a href="signout.php">Sign out</a>';  
    }  
    else  
    {  
        echo '<a href="signin.php">Sign in</a> or <a href="sign up">create an account</a>.';  
    }  
echo'</div>';
?>
</div>
<div id="content">
<div id="footer">Created by Christech for Learning Only</div>
</div>
</div>
</body>
</html>

<?php
//signin.php
include 'connect.php';
include 'header.php';

echo '<h3>Sign in</h3>';
//first, check if the user is already signed in. If that is the case, there is no need to display this page  

if(isset($_SESSION['signed_in']) && $_SESSION['signed_in'] == true)
{
	echo 'You are alredy signed in, you can <a href="signout.php>Sign Out</a> if you wish"';
	}
	
	else
	{
		if($_SERVER['REQUEST_METHOD'] != 'POST')
		
		{
			/*the form hasn't been posted yet, display it 
      note that the action="" will cause the form to post to the same page it is on */
	  echo'<form method="post" action="">
	  Username: <input type="text" name="user_name" />
	  Password: <input type="text" name="user_pass" />
	  <input type="submit" value="Sign in" />
	  </form>';
			}
	else 
    { 
        /* so, the form has been posted, we'll process the data in three steps:  
            1.  Check the data  
            2.  Let the user refill the wrong fields (if necessary)  
            3.  Varify if the data is correct and return the correct response  
        */  
        $errors = array(); /* declare the array for later use */  
          
        if(!isset($_POST['user_name']))  
        {  
            $errors[] = 'The username field must not be empty.';  
        }  
          
        if(!isset($_POST['user_pass']))  
        {  
            $errors[] = 'The password field must not be empty.';  
        }  
          
        if(!empty($errors)) /*check for an empty array, if there are errors, they're in this array (note the ! operator)*/  
        {  
            echo 'Uh-oh.. a couple of fields are not filled in correctly..'; 
            echo '<ul>'; 
            foreach($errors as $key => $value) /* walk through the array so all the errors get displayed */ 
            { 
                echo '<li>' . $value . '</li>'; /* this generates a nice error list */ 
            } 
            echo '</ul>'; 
        } 
		
	else
	{
		//the form has been posted without, so save it 
        //notice the use of mysql_real_escape_string, keep everything safe! 
        //also notice the sha1 function which hashes the password
		
		$sql = "SELECT user_id, user_name, user_level 
		FROM users 
		WHERE user_name = '". mysql_real_escape_string($_POST['user_name']) ."' AND user_pass = '". sha1($_POST['user_pass']) ."'";
		$result = mysql_query($sql);
		
		if(!$result)
		{
			  //something went wrong, display the error  
                echo 'Something went wrong while signing in. Please try again later.'; 
                //echo mysql_error(); //debugging purposes, uncomment when needed 
            } 
            else 
            { 
                //the query was successfully executed, there are 2 possibilities 
                //1. the query returned data, the user can be signed in 
                //2. the query returned an empty result set, the credentials were wrong 
			if (mysql_num_rows($result) == 0){
				
				echo'You have supplied a wrong user/password combination. Please try again';
				}
			
			else
			{
				//set the $_SESSION['signed_in'] variable to TRUE
				$_SESSION['signed_in'] = true;
				//we also put the user_id and user_name values in the $_SESSION, so we can use it at various pages 
				 while($row = mysql_fetch_assoc($result)) 
                    { 
                        $_SESSION['user_id']    = $row['user_id']; 
                        $_SESSION['user_name']  = $row['user_name']; 
                        $_SESSION['user_level'] = $row['user_level']; 
                    } 
                     
                    echo 'Welcome, ' . $_SESSION['user_name'] . '. <a href="index.php">Proceed to the forum overview</a>.'; 
                } 
            } 
        } 
    } 
} 
 
include 'footer.php';  




?>
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