Wordpress Google jQuery with fallback

<?php
add_action( 'wp_enqueue_scripts', 'wps_enqueue_jquery' );
/**
 * Enqueue jQuery from Google CDN with fallback to local WordPress
 *
 * @link http://codex.wordpress.org/Function_Reference/wp_enqueue_script
 * @link http://codex.wordpress.org/Function_Reference/wp_register_script
 * @link http://codex.wordpress.org/Function_Reference/wp_deregister_script
 * @link http://codex.wordpress.org/Function_Reference/get_bloginfo
 * @link http://codex.wordpress.org/Function_Reference/is_wp_error
 * @link http://codex.wordpress.org/Function_Reference/set_transient
 * @link http://codex.wordpress.org/Function_Reference/get_transient
 *
 * @uses get_transient()        Get the value of a transient.
 * @uses set_transient()        Set/update the value of a transient.
 * @uses is_wp_error()          Check whether the passed variable is a WordPress Error.
 * @uses get_bloginfo()         returns information about your site.
 * @uses wp_deregister_script() Deregisters javascripts for use with wp_enqueue_script() later.
 * @uses wp_register_script()   Registers javascripts for use with wp_enqueue_script() later.
 * @uses wp_enqueue_script()    Enqueues javascript.
 */
function wps_enqueue_jquery() {
    // Setup Google URI, default
    $protocol = ( isset( $_SERVER['HTTPS'] ) && 'on' == $_SERVER['HTTPS'] ) ? 'https' : 'http';
    // Get Latest Version
    $url      = $protocol . '://code.jquery.com/jquery-latest.min.js';

    // Get Specific Version
    //$url      = $protocol . '://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js';

    // Setup WordPress URI
    $wpurl = get_bloginfo( 'wpurl') . '/wp-includes/js/jquery/jquery.js';

    // Setup version
    $ver = null;

    // Deregister WordPress default jQuery
    wp_deregister_script( 'jquery' );

    // Check transient, if false, set URI to WordPress URI
    delete_transient( 'google_jquery' );

    if ( 'false' == ( $google = get_transient( 'google_jquery' ) ) ) {
        $url = $wpurl;
    }
    // Transient failed
    elseif ( false === $google ) {
        // Ping Google
        $resp = wp_remote_head( $url );

        // Use Google jQuery
        if ( ! is_wp_error( $resp ) && 200 == $resp['response']['code'] ) {
            // Set transient for 5 minutes
            set_transient( 'google_jquery', 'true', 60 * 5 );
        }

        // Use WordPress jQuery
        else {
            // Set transient for 5 minutes
            set_transient( 'google_jquery', 'false', 60 * 5 );

            // Use WordPress URI
            $url = $wpurl;

            // Set jQuery Version, WP stanards
            $ver = '1.8.2';
        }
    }

    // Register surefire jQuery
    wp_register_script( 'jquery', $url, array(), $ver, true );

    // Enqueue jQuery
    wp_enqueue_script( 'jquery' );
}
?>