<?php show_source(end(explode('/',$_SERVER['PHP_SELF']))); echo "<hr>"; ?>
<?php

class EmphasisHTMLDecorator{
    static $openingTag = '<em>';
    static $closingTag = '</em>';
    private $string;
    public function __construct($string){
        $this->string = $string;
    }
    public function getString(){
        return self::$openingTag . $this->string . self::$closingTag;
    }
}

$html = 'Hello, world!';
$em = new EmphasisHTMLDecorator($html);

echo 'The opening tag is: ' . htmlspecialchars(EmphasisHTMLDecorator::$openingTag);

?>