Obfuscate an email address output with PHP and CSS

obfuscate-email.php

<?php
/**
 * Obfuscate an email address php output with some CSS help
 * 
 * @author Joshua David Nelson, josh@joshuadnelson.com
 * Based on:
 * @link http://perishablepress.com/best-method-for-email-obfuscation/
 */
 
// PHP Output - replace the $instance['email'] with whatever input/variable is storing your clean email address
if( $instance['email'] ) {
	// Reverse the order of the email address - note that the CSS for this doesn't work in IE < 9.0
	$email = strrev( $instance['email'] ); 
	// separate out the host and the name
	$parts = explode('@', $email );
	// put it all back together, backwards (CSS will reverse it),
	// with a hidden 'null' span and using an HTML character for the 'at' symbol
	echo '<div class="email">' . $parts[0] . '<span>llun</span>&#64;' . $parts[1] . '</div>'; 
}

obfustace-style.css

/**
 * Obfuscate an email address php output with some CSS help
 * 
 * @author Joshua David Nelson, josh@joshuadnelson.com
 * Based on:
 * @link http://perishablepress.com/best-method-for-email-obfuscation/
 */

/* CSS Output */
.email {
    unicode-bidi: bidi-override; /* Doesn't work well in IE versions before 9.0 */
    direction: rtl;
}
.email span {
    display: none;
}