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mysqli (Loads page with Error!)

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I have been trying to get this code to tell me that I have successfuly changed my pass and will login after Chapter 9. But, when I go through with the script it takes me to the Error porition of the code and prints out the Query error. Also it changes the password, so I know that is working... :D


System Error

Your password could not be changed due to a system error. We apologize for any inconvenience.

Query: UPDATE users SET password=SHA('password') WHERE user_id=1


Thank you in advance.


<?php # Script 7.8 - password.php
// This page lets a user change their password.

// Set the page title and include the HTML header.
$page_title = 'Change Your Password';
include ('./includes/header.html');

// Check if the form has been submitted.
if (isset($_POST['submitted'])) {

    require_once ('../mysql_connect.php'); // Connect to the db.
    // Create a function for escaping the data.
    function escape_data($data) {
        global $dbc; // Need the connection.
        if (ini_get('magic_quotes_gpc')) {
            $data = stripslashes($data);
        return mysqli_real_escape_string($dbc,trim($data));
    } // End of function.

    $errors = array(); // Initialize error array.
    // Check for an email address.
    if (empty($_POST['email'])) {
        $errors[] = 'You forgot to enter your email address.';
    } else {
        $e = escape_data($_POST['email']);
    // Check for an existing password.
    if (empty($_POST['password'])) {
        $errors[] = 'You forgot to enter your existing password.';
    } else {
        $p = escape_data($_POST['password']);

    // Check for a password and match against the confirmed password.
    if (!empty($_POST['password1'])) {
        if ($_POST['password1'] != $_POST['password2']) {
            $errors[] = 'Your new password did not match the confirmed new password.';
        } else {
            $np = escape_data($_POST['password1']);
    } else {
        $errors[] = 'You forgot to enter your new password.';
    if (empty($errors)) { // If everything's OK.
        // Check that they've entered the right email address/password combination.
        $query = "SELECT user_id FROM users WHERE (email='$e' AND password=SHA('$p') )";
        $result = mysqli_query($dbc,$query);
        $num = mysqli_num_rows($result);
        if (mysqli_num_rows($result) == 1) { // Match was made.
            // Get the user_id.
            $row = mysqli_fetch_array($result);

            // Make the UPDATE query.
            $query = "UPDATE users SET password=SHA('$np') WHERE user_id=$row[0]";        
            $result = @mysqli_query($dbc,$query);
            if (mysqli_affected_rows($result) == 1) { // If it ran OK.
                // Send an email, if desired.
                // Print a message.
                echo '<h1 id="mainhead">Thank you!</h1>
                <p>Your password has been updated. In Chapter 9 you will actually be able to log in!</p><p><br /></p>';    
                // Include the footer and quit the script (to not show the form).
                include ('./includes/footer.html'); 
            } else { // If it did not run OK.
                echo '<h1 id="mainhead">System Error</h1>
                <p class="error">Your password could not be changed due to a system error. We apologize for any inconvenience.</p>'; // Public message.
                echo '<p>' . mysqli_error() . '<br /><br />Query: ' . $query . '</p>'; // Debugging message.
                include ('./includes/footer.html'); 
        } else { // Invalid email address/password combination.
            echo '<h1 id="mainhead">Error!</h1>
            <p class="error">The email address and password do not match those on file.</p>';
    } else { // Report the errors.
        echo '<h1 id="mainhead">Error!</h1>
        <p class="error">The following error(s) occurred:<br />';
        foreach ($errors as $msg) { // Print each error.
            echo " - $msg<br />\n";
        echo '</p><p>Please try again.</p><p><br /></p>';
    } // End of if (empty($errors)) IF.

    mysqli_close($dbc); // Close the database connection.
} // End of the main Submit conditional.
<h2>Change Your Password</h2>
<form action="password.php" method="post">
    <p>Email Address: <input type="text" name="email" size="20" maxlength="40" value="<?php if (isset($_POST['email'])) echo $_POST['email']; ?>"  /> </p>
    <p>Current Password: <input type="password" name="password" size="10" maxlength="20" /></p>
    <p>New Password: <input type="password" name="password1" size="10" maxlength="20" /></p>
    <p>Confirm New Password: <input type="password" name="password2" size="10" maxlength="20" /></p>
    <p><input type="submit" name="submit" value="Register" /></p>
    <input type="hidden" name="submitted" value="TRUE" />
include ('./includes/footer.html');

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It appears at though the issue is with the mysqli_affected_rows function -- you run the UPDATE on the password, then make sure that it was changed. However, if you were to enter the same password, the UPDATE would return zero affected rows, and your if condition would fail. Similarly, it would fail if there were an error if your UPDATE query.


I recommend echoing the value of the that mysqli_affected_rows($result) in question, and see if it's -1, 0, or 1 (since it's by UID, it better not be greater than one!). That'll point you in the right direction.


Hope that helps.

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