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My Site Of Quotes Application Error

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Going through the example application "my site of quotes" in the book. while testing the application i experience a problem when i add a new quote on the add_quote.php page. the quote is added to the database but this is the error message i got:


Fatal error: Cannot redeclare is_administrator() (previously declared in C:\wamp\www\includes\functions.php:7) in C:\wamp\www\includes\functions.php on line 16


here the add_quote page code:


// Define a page title and include the header:
define('TITLE', 'Add a Quote');

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>';

// Check for a form submission:
if ($_SERVER['REQUEST_METHOD'] == 'POST') { // Handle the form.

if ( !empty($_POST['quote']) && !empty($_POST['source']) ) {

	// Need the database connection:

	// Prepare the values for storing:
	$quote = mysql_real_escape_string(trim(strip_tags($_POST['quote'])), $dbc);
	$source = mysql_real_escape_string(trim(strip_tags($_POST['source'])), $dbc);

	// Create the "favorite" value:
	if (isset($_POST['favorite'])) {
		$favorite = 1;
	} else {
		$favorite = 0;

	$query = "INSERT INTO quotes (quote, source, favorite) VALUES ('$quote', '$source', $favorite)";
	$result = mysql_query($query, $dbc);

	if (mysql_affected_rows($dbc) == 1){
		// Print a message:
		print '<p>Your quotation has been stored.</p>';
	} else {
		print '<p class="error">Could not store the quote because:<br />' . mysql_error($dbc) . '.</p><p>The query being run was: ' . $query . '</p>';

	// Close the connection:

} 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>

<?php include('templates/header.html'); ?>

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