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Chapter 13 Fatal error with is_administrator()

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Not sure why I keep getting this error? Could someone please help me.


This is the code I used for add_quote.php:


<?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');
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:
		$quote = mysqli_real_escape_string($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:
	} 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('includes/footer.php'); 


And then the one for functions.php:

<?php // Script 13.2 - functions.php
/* This page defines custom functions. */

// This function checks if the user is an administrator.
// This function takes two optional values.
// This function returns a Boolean value.
function is_administrator($name = 'Samuel', $value = 'Clemens') {

	// Check for the cookie and check its value:
	if (isset($_COOKIE[$name]) && ($_COOKIE[$name] == $value)) {
		return true;
	} else {
		return false;
} // End of is_administrator() function.


Could someone please also explain the fact that we had to use Samuel for the $name and Clemens for the $value? I am so confused... I'd really appreciate any clarification! =]


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