Viewing file:  12.php (2.1 KB) -rw-rw-rw-
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<?php
/**
* A standard header for a web page
*/
class StandardHeader {
/**
* The header HTML is stored here
*/
var $header='';
/**
* The constructor, taking the name of the page
*/
function StandardHeader ($title) {
$html = <<<EOD
<html>
<head>
<title> $title </title>
</head>
<body>
<h1>$title</h1>
EOD;
$this->setHeader($html);
}
/**
* General method for adding to the header
*/
function setHeader($string) {
if ( !empty ($this->header ) ) {
$this->header .= $string;
} else {
$this->header = $string;
}
}
/**
* Fetch the header
*/
function getHeader() {
return $this->header;
}
}
/**
* Subclass for dealing with Categories, building a breadcrumb menu
*/
class CategoryHeader extends StandardHeader {
/**
* Constructor, taking the category name and the pages base URL
*/
function CategoryHeader($category,$baseUrl) {
// Call the parent constructor
parent::StandardHeader($category);
// Build the breadcrumbs
$html = <<<EOD
<p><a href="$baseUrl">Home</a> > <a href="$baseUrl?category=$category">$category</a></p>
EOD;
// Call the parent setHeader() method
$this->setHeader($html);
}
}
// Set the base URL
$baseUrl = '12.php';
// An array of valid categories
$categories = array ('PHP','MySQL','CSS');
// Check to see if we're viewing a valid category
if ( isset ( $_GET['category'] ) && in_array($_GET['category'],$categories) ) {
// Instantiate the subclass
$header = new CategoryHeader($_GET['category'],$baseUrl);
} else {
// Otherwise it's the home page. Instantiate the Parent class
$header = new StandardHeader('Home');
}
// Display the header
echo ( $header->getHeader() );
?>
<h2>Categories</h2>
<p><a href="<?php echo ($baseUrl); ?>?category=PHP">PHP</a></p>
<p><a href="<?php echo ($baseUrl); ?>?category=MySQL">MySQL</a></p>
<p><a href="<?php echo ($baseUrl); ?>?category=CSS">CSS</a></p>
</body>
</html>
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