Php login script not working,please help!

raghu_tak · June 11, 2013

hi friends
i am learning php from head first php book
i have written a login script code from book that is similar to it
but when i submit the user info
it display again this login script.
but when i run this book's code it works fine.
the both script are similar.
the following is my code and next to it is book's.
My code:-

<?php
session_start();
$errormsg="";
if(!isset($_SESSION['user_id']))
{
   if(isset($_POST['submit']))
   {
      $dbc=mysqli_connect('localhost','root','','mismatch')
      or die('Error connecting database');
      $uname=mysqli_real_escape_string($dbc,trim($_POST['user_name']));
      $pword=mysqli_real_escape_string($dbc,trim($_POST['pass_word']));

      if((!empty($uname))&&(!empty($pword)))
      {

         $query="SELECT * FROM 'mismatch'.'mismatch_user' WHERE username='$uname' AND password=SHA('$pword')";
         $result=mysqli_query($dbc,$query)
         or die('Error quering database');

         if(mysqli_num_rows($result) == 1)
         {
            $row=mysqli_fetch_array($result);
            $_SESSION['user_id']=$row['user_id'];
            $_SESSION['username']=$row['username'];
            echo'You have successfully logged in as '.$_SESSION['username'].'.<br/>';
            echo'<a href=edit.php>Edit your profile</a>';
            mysqli_close($dbc);

         }
         else
         {
            $errormsg='Sorry try different user name.';
         }
      }
      else
      {
         $errormsg='Please enter all the information to log in.';
      }

   }
}
?>
<html>
<head><title>
Log in
</title></head>
<body>
<h1 style="color:Darkcyan"><center>Welcome to Mismatch.com</center></h1>
<p><center><i>Please enter your log in info to access your page.</i></center></p>
<?php
if(empty($_SESSION['user_id']))
{
   echo $errormsg;
?>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<fieldset>
<legend>Log in</legend>
<label for="user_name">Username:</label>
<input type="text" name="user_name" value="<?php if(!empty($uname)) echo $uname; ?>"/>

<label for="pass_word">Password:</label>
<input type="password" name="pass_word"/>
</fieldset>
<input type="submit" name="login" value="Log in">
</form>
<?php

}
?>
</body></html>

and here is book's code

<?php

// Start the session
session_start();

// Clear the error message
$error_msg = "";

// If the user isn't logged in, try to log them in
if (!isset($_SESSION['user_id'])) {
if (isset($_POST['submit'])) {
// Connect to the database
$dbc = mysqli_connect('localhost','root','','mismatch');

// Grab the user-entered log-in data
$user_username = mysqli_real_escape_string($dbc, trim($_POST['username']));
$user_password = mysqli_real_escape_string($dbc, trim($_POST['password']));

if (!empty($user_username) && !empty($user_password)) {
// Look up the username and password in the database
$query = "SELECT user_id, username FROM mismatch_user WHERE username = '$user_username' AND password = SHA('$user_password')";
$data = mysqli_query($dbc, $query);

if (mysqli_num_rows($data) == 1) {
// The log-in is OK so set the user ID and username session vars (and cookies), and redirect to the home page
$row = mysqli_fetch_array($data);
$_SESSION['user_id'] = $row['user_id'];
$_SESSION['username'] = $row['username'];

         echo'you have successfully logged in as '.$_SESSION['username'].'.<br/>';
         echo'<a href=edit.php>Edit your profile</a>';
}
else {
// The username/password are incorrect so set an error message
$error_msg = 'Sorry, you must enter a valid username and password to log in.';
}
}
else {
// The username/password weren't entered so set an error message
$error_msg = 'Sorry, you must enter your username and password to log in.';
}
}
}
?>

<html>
<head>

<title>Mismatch - Log In</title>

</head>
<body>
<h3>Mismatch - Log In</h3>

<?php
// If the session var is empty, show any error message and the log-in form; otherwise confirm the log-in
if (empty($_SESSION['user_id'])) {
echo $error_msg;
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<fieldset>
<legend>Log In</legend>
<label for="username">Username:</label>
<input type="text" name="username" value="<?php if (!empty($user_username)) echo $user_username; ?>" /><br />
<label for="password">Password:</label>
<input type="password" name="password" />
</fieldset>
<input type="submit" value="Log In" name="submit" />
</form>

<?php

}
?>

</body>
</html>

please help me friends!!

mac_gyver · June 11, 2013

you changed the name of your submit button in the form, so the code if(isset($_POST['submit])) no longer works.

raghu_tak · June 11, 2013

hell yeah
it was silly mistake

thanks a lot

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