Having php issues

Having issues with a PHP i copied out of the book for an assignment.

<?php // Script 13.7 - add_quote.php 
/* This script adds a quote. */ 
// Define a page title and include the header: 
define('TITLE', 'Add a Quote'); 
include('templates/header.html'); 
print '<h2>Add a Quotation</h2>'; 
// Restrict access to administrators only: 
if (!is_administrator()) { 
print '<h2>Access Denied!</h2><p class="error">You do not have permission to access this page.</p>'; 
include('templates/footer.html'); 
exit(); 
} 
// Check for a form submission: 
if ($_SERVER['REQUEST_METHOD'] =='POST') { // Handle the form. 
if ( !empty($_POST['quote']) && !empty($_POST['source']) ) { 
// Need the database connection: 
include('../mysqli_connect.php'); 
// Prepare the values for storing: 
$quote = mysqli_real_escape_string($dbc,trim(strip_tags($_POST['quote']))); 
$source = mysqli_real_escape_string($dbc,trim(strip_tags($_POST['source']))); 
// Create the "favorite" value: 
if (isset($_POST['favorite'])) { 
$favorite = 1; 
} else { 
$favorite = 0; 
} 
$query = "INSERT INTO quotes (quote, source, favorite) VALUES ('$quote', '$source', $favorite)"; 
mysqli_query($dbc, $query); 
if (mysqli_affected_rows($dbc) == 1){ 
// Print a message: 
print '<p>Your quotation has been stored.</p>'; 
} else { 
print '<p class="error">Could not store the quote because:<br>' . mysqli_error($dbc) . '.</p><p>The query being run was: ' . $query . '</p>'; 
} 
// Close the connection: 
mysqli_close($dbc); 
} else { // Failed to enter a quotation. 
print '<p class="error">Please enter a quotation and a source!</p>'; 
} 
} // End of submitted IF. 
// Leave PHP and display the form: 
?> 
<form action="add_quote.php" method="post"> 
<p><label>Quote <textarea name="quote" rows="5" cols="30"></textarea></label></p> 
<p><label>Source <input type="text" name="source"></label></p> 
<p><label>Is this a favorite? <input type="checkbox" name="favorite" value="yes"></label></p> 
<p><input type="submit" name="submit" value="Add This Quote!"></p> 
</form> 
<?php include('templates/footer.html'); ?

which is giving me the error

Notice: Undefined variable: dbc in C:\xampp\htdocs\CH13\add_quote.php on line 26

Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, null given in C:\xampp\htdocs\CH13\add_quote.php on line 26

Notice: Undefined variable: dbc in C:\xampp\htdocs\CH13\add_quote.php on line 27

Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, null given in C:\xampp\htdocs\CH13\add_quote.php on line 27

Notice: Undefined variable: dbc in C:\xampp\htdocs\CH13\add_quote.php on line 37

Warning: mysqli_query() expects parameter 1 to be mysqli, null given in C:\xampp\htdocs\CH13\add_quote.php on line 37

Notice: Undefined variable: dbc in C:\xampp\htdocs\CH13\add_quote.php on line 39

Warning: mysqli_affected_rows() expects parameter 1 to be mysqli, null given in C:\xampp\htdocs\CH13\add_quote.php on line 39

Notice: Undefined variable: dbc in C:\xampp\htdocs\CH13\add_quote.php on line 43

Warning: mysqli_error() expects parameter 1 to be mysqli, null given in C:\xampp\htdocs\CH13\add_quote.php on line 43 Could not store the quote because: .

The query being run was: INSERT INTO quotes (quote, source, favorite) VALUES ('', '', 0)

Notice: Undefined variable: dbc in C:\xampp\htdocs\CH13\add_quote.php on line 47

Warning: mysqli_close() expects parameter 1 to be mysqli, null given in C:\xampp\htdocs\CH13\add_quote.php on line 47

EDIT: seems it is a connection error. currently trying to fix the connection. atm seems nothing i try is working