/*
Make sure your metabox is set thus:
'pages' => array( 'page' ), // Post
'show_on' => array( 'key' => 'front-page', 'value' => '' ),
*/

}
add_filter( 'cmb_show_on', 'ed_metabox_include_front_page', 10, 2 );

function ed_get_attachment_id_by_url($url) {
    global $wpdb;
    $attachment = $wpdb->get_col($wpdb->prepare("SELECT ID FROM {$wpdb->prefix}posts WHERE guid='%s';", $url));
    if ( $attachment ) {
        return $attachment[0];
    } else {
        return false;
    }
}

/*************
PROTECT SHORTCODE - If user is not logged in, content within [protect] is replaced with a predefined string.
*****************/

add_action( 'init', 'dm2_register_protect_shortcode');

function dm2_register_protect_shortcode() {
   add_shortcode('protect', 'dm2_protect_function');
}

function dm2_protect_function($atts, $content = null) {

     if ( is_user_logged_in() ) {
          $return_string = $content;
     } else {
          $return_string = 'You must be logged in to view this content';
     }

     wp_reset_query();
     return $return_string;
}

We’ll see if that fixes the kernel panics.

Download the categories-images plugin (zip)

Update (10 Oct 12): The first upload had a bit of code left in from my own use of the plugin that limited it to a certain taxonomy. I’ve removed it now so the plugin works on all taxonomies as it should.

The key points are:

• z_edit_taxonomy_field() and z_add_taxonomy_field()  are modified to have a separate button to upload the image rather than clicking the text box. It means the user can manually type the ID if they wish.
• z_script() grabs the image ID from thickbox instead of the URL. Because thickbox returns an img tag with the image, the only way to get the ID is to chop it out of the class.
• z_save_taxonomy_image() validates the image ID before saving in case the user types an ID in the text box.

add_filter('nav_menu_css_class' , 'ed_page_title_class' , 10 , 2);
function ed_page_title_class($classes, $item){
  $classes[] = sanitize_title('menu-item-' . $item->title);
  return $classes;
}

add_action('body_class', 'ed_if_featured_image_class' );
function ed_if_featured_image_class($classes) {
 if ( has_post_thumbnail() ) {
 array_push($classes, 'has-featured-image');
 }
 return $classes;
}