Add Font Awesome With IE7 Support to WordPress using a CDN

wordpress-font-awesome-ie7-cdn.php

<?php
/**
 * Registers and loads font awesome
 * CSS files using a CDN.
 *
 * @link http://www.bootstrapcdn.com/#tab_fontawesome
 * @author FAT Media
 */
add_action( 'wp_enqueue_scripts', 'prefix_enqueue_awesome' );
/**
 * Register the awesomeness and add IE7 support
 *
 * @global $wp_styles
 * @global $is_IE
 */
function prefix_enqueue_awesome() {
	global $wp_styles, $is_IE;
	wp_enqueue_style( 'prefix-font-awesome', '//netdna.bootstrapcdn.com/font-awesome/3.2.0/css/font-awesome.min.css', array(), '3.2.0' );
	if ( $is_IE ) {
		wp_enqueue_style( 'prefix-font-awesome-ie', '//netdna.bootstrapcdn.com/font-awesome/3.2.0/css/font-awesome-ie7.min.css', array('prefix-font-awesome'), '3.2.0' );
		// Add IE conditional tags for IE 7 and older
		$wp_styles->add_data( 'prefix-font-awesome-ie', 'conditional', 'lte IE 7' );
	}
}