Normally, when you visit the login screen, there’s a nice WordPress image. If you want to change that to something else, this is how:
add_action('login_head', 'change_login_image');
function change_login_image() {
$name = urlencode(get_option('blogname'));
?><style type="text/css"> h1 a { background-image: url('http://dummyimage.com/310x70/f9/000&text=++<?php echo $name; ?>+'); } </style><?php
}
Customize the information that is displayed on the ‘posts’ page
Adding a column labeled “Thumbnail” (and delete the “Comments” column).
add_filter( 'manage_edit-post_columns', 'set_columns' );
function set_columns($columns) {
$columns['thumbnail'] = 'Thumbnail';
unset( $columns['comments'] );
return $columns;
}
Now we need to tell WordPress what to do with this new “Thumbnail” space. Here, we’re checking for the existence of a featured image and displaying it, or noting that there is no thumbnail.
add_action( 'manage_posts_custom_column', 'fill_columns' );
function fill_columns($column) {
global $post;
switch($column) {
case 'thumbnail' :
if (has_post_thumbnail($post->ID))
echo get_the_post_thumbnail($post->ID, array(50, 50));
else
echo '<em>no thumbnail</em>';
break;
}
}
If you need to hide menus from the sidebar of the administration area, you can use this. Keep in mind, this method does not block access, just hides the link.
add_action('admin_menu', 'hide_menu_links');
function hide_menu_links(){
global $menu,$submenu;
if ($submenu['plugins.php'][15][0] == 'Editor')
unset($submenu['plugins.php'][15]);
if ($menu[15][0] == 'Links')
unset($menu[15]);
}
// $menu
// [2] => {Dashboard}
// [4] => {separator}
// [5] => {Posts}
// [10] => {Media}
// [15] => {Links}
// [20] => {Pages}
// [25] => {Comments}
// [59] => {separator}
// [60] => {Appearance
// [65] => {Plugins}
// [70] => {Users}
// [75] => {Tools}
// [80] => {Settings}
// [99] => {separator}
// $submenu
// [index.php] =>
// [0] => {Dashboard}
// [10] => {Updates}
//
// [edit.php] =>
// [5] => {Posts}
// [10] => {Add New}
// [15] => {Categories}
// [16] => {Post Tags}
//
// [upload.php] =>
// [5] => {Library}
// [10] => {Add New}
//
// [link-manager.php] =>
// [5] => {Links}
// [10] => {Add New}
// [15] => {Link Categories}
//
// [edit.php?post_type=page] =>
// [5] => {Pages}
// [10] => {Add New}
//
// [themes.php] =>
// [5] => {Themes}
// [7] => {Widgets}
// [10] => {Menus}
//
// [plugins.php] =>
// [5] => {Plugins}
// [10] => {Add New}
// [15] => {Editor}
//
// [users.php] =>
// [5] => {Users}
// [10] => {Add New}
// [15] => {Your Profile
//
// [tools.php] =>
// [5] => {Tools}
// [10] => {Import}
// [15] => {Export}
//
// [options-general.php] =>
// [10] => {General}
// [15] => {Writing}
// [20] => {Reading}
// [25] => {Discussions}
// [30] => {Media}
// [35] => {Privacy}
// [40] => {Permalinks}
Here’s a simple widget for displaying upcoming posts. Title of widget and number of posts shown is configurable.
add_action( 'widgets_init', 'upcoming_posts_widget_load_widget' ); /* Add our function to the widgets_init hook. */
function upcoming_posts_widget_load_widget() { register_widget( 'upcoming_posts_widget' ); } /* Function that registers our widget. */
class upcoming_posts_widget extends WP_Widget {
function upcoming_posts_widget() {
$widget_ops = array( 'classname' => 'upcoming_posts', 'description' => 'Upcoming Posts Widget' ); /* Widget settings. */
$control_ops = array( 'id_base' => 'upcoming_posts' ); /* Widget control settings. */
$this->WP_Widget( 'upcoming_posts', 'Upcoming Posts Widget', $widget_ops, $control_ops ); /* Create the widget. */
}
function widget( $args, $instance ) {
extract( $args ); /* before/after widget, before/after title (defined by themes). */
extract($instance);
echo $before_widget;
echo $before_title . $title . $after_title;
echo '<ul>';
$posts = get_posts("post_status=future&numberposts=$numberposts&order=ASC");
$posts = array_reverse($posts);
foreach ($posts as $p) {
echo '<li>'. $p->post_title .'</li>';
}
echo '</ul>';
echo $after_widget;
}
function update( $new_instance, $old_instance ) {
$instance = $old_instance;
$instance['title'] = strip_tags( $new_instance['title'] );
$instance['numberposts'] = (int) $new_instance['numberposts'];
return $instance;
}
function form( $instance ) {
$defaults = array( 'title' => 'Upcoming Posts', 'numberposts' => 3 );
$instance = wp_parse_args( (array) $instance, $defaults );
?>
<p>
<label for="<?php echo $this->get_field_id( 'title' ); ?>">Title:</label>
<input type="text" class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" />
</select>
</p>
<p>
<label for="<?php echo $this->get_field_id( 'numberposts' ); ?>">Number Posts:</label>
<input type="text" class="widefat" id="<?php echo $this->get_field_id( 'numberposts' ); ?>" name="<?php echo $this->get_field_name( 'numberposts' ); ?>" value="<?php echo $instance['numberposts']; ?>" />
</select>
</p>
<?php
}
}
Adding a new post type, for when ‘posts’ and ‘pages’ just won’t do.
add_action( 'init', 'my_new_post_types' );
function my_new_post_types() {
$labels = array(
'name' => _x('Hotels', 'post type general name'),
'singular_name' => _x('Hotel', 'post type singular name'),
'add_new' => _x('Add New', 'hotel'),
'add_new_item' => __('Add New Hotel'),
'edit_item' => __('Edit Hotel'),
'new_item' => __('New Hotel'),
'view_item' => __('View Hotel'),
'search_items' => __('Search Hotels'),
'not_found' => __('No hotels found'),
'not_found_in_trash' => __('No hotels found in Trash'),
'parent_item_colon' => '',
'menu_name' => 'Hotels'
);
$args = array(
'labels' => $labels,
'public' => true,
'publicly_queryable' => true,
'show_ui' => true,
'show_in_menu' => true,
'query_var' => true,
'rewrite' => true,
'capability_type' => 'post',
'has_archive' => true,
'hierarchical' => false,
'menu_position' => null,
'supports' => array('title','editor','author','thumbnail','excerpt','comments')
);
register_post_type('hotel',$args);
}
In case you need to hide the plugin update count (can’t/don’t want to update yet) you can hide it with this. Can be especially useful if you don’t want clients to wander over the the update area.
add_action('admin_menu', 'remove_plugin_update_count');
function remove_plugin_update_count(){
global $menu, $submenu;
$menu[65][0] = 'Plugins';
$submenu['index.php'][10][0] = 'Updates';
}
When you need more than just ‘categories’ and ‘tags’ use custom taxonomies.
Especially useful in combination with custom post types.
add_action('init', 'my_new_taxonomies');
function my_new_taxonomies() {
$labels = array(
'name' => __( 'Action Hooks' ),
'singular_name' => __( 'Action Hook' ),
'search_items' => __( 'Search Action Hooks' ),
'popular_items' => __( 'Popular Action Hooks' ),
'all_items' => __( 'All Action Hooks' ),
'parent_item' => null,
'parent_item_colon' => null,
'edit_item' => __( 'Edit Action Hook' ),
'update_item' => __( 'Update Action Hook' ),
'add_new_item' => __( 'Add New Action Hook' ),
'new_item_name' => __( 'New Action Hook' ),
'separate_items_with_commas' => __( 'Separate hooks with commas' ),
'add_or_remove_items' => __( 'Add or remove hooks' ),
'choose_from_most_used' => __( 'Choose from the most used hooks' ),
'menu_name' => __( 'Action Hooks' ),
);
register_taxonomy('action_hook','post',array(
'hierarchical' => false,
'labels' => $labels,
'show_ui' => true,
'query_var' => true,
'rewrite' => array( 'slug' => 'action_hook' ),
));
}