Add a new widget to the dashboard. Note, this will add the widget to the bottom of the page. If you want to try to move it to the top, check out the Codex page about dashboard widgets
add_action('wp_dashboard_setup', 'add_custom_dash_boxes');
function add_custom_dash_boxes() {
wp_add_dashboard_widget(
'welcome_box',
__( 'Welcome', 'myplugin_textdomain' ),
'welcome_box_text'
);
}
function welcome_box_text() {
echo 'Custom welcome text here';
}
If you need to auto-append information to the end of your page/post content, there’s an easier way to do it than editing your theme.
add_filter( 'the_content', 'append_to_content' );
function append_to_content($content) {
global $post;
//if you want to restrict this to a specific post type
if (get_post_type($post) == 'post') {
$content .= '<p style="text-align:center;">***</p>';
}
return $content;
}
Can be especially useful for auto-appending custom field information
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 $name; ?>+'); } </style><?php
}
Want to put something else besides “Howdy” and “Log Out” in the upper right hand corner? It’s easy!
add_filter('admin_user_info_links', 'add_user_id_to_top');
function add_user_id_to_top($links) {
global $current_user;
get_currentuserinfo();
$links[] = ' | User ID: '. $current_user->ID;
return $links;
}
In this example, we’re adding the current user’s ID to the top. I also like adding the blog ID up there when working on a WordPress network.
add_filter('admin_user_info_links', 'add_site_id_to_top');
function add_site_id_to_top($links) {
global $blog_id;
$links[] = ' | Site ID: '. $blog_id;
return $links;
}
If “Howdy” just ain’t your thing, use this to change it to something more your style.
add_filter('admin_user_info_links', 'change_howdy');
function change_howdy($links) {
$links[5] = str_replace('Howdy', 'Greetings', $links[5]);
return $links;
}
Ever use that favorites menu up by the “Howdy” greeting? I never really did until I started customizing the options.
One of my favorites is adding a link to the master options page (wp-admin/options.php)
add_filter('favorite_actions', 'custom_favorites');
function custom_favorites($actions) {
$actions['options.php'] = array('All Settings', 'unfiltered_html'); // this line adds an item
return $actions;
}
Or, remove the menu entirely
add_filter('favorite_actions', 'remove_favorites');
function remove_favorites($actions) {
$actions = array();
return $actions;
}
If you want to see something other than “Search Engines Blocked” when, well, search engines are blocked, you can use this to customize the text
add_filter('privacy_on_link_text', 'change_privacy_text');
function change_privacy_text() {
_e('Privacy Mode Enabled');
};
If you find that you need to offer some non-standard date or time formats to the general settings page, this will help.
add_filter('date_formats', 'add_date_format');
function add_date_format($original) {
$more = array('D, M jS, Y');
return array_merge($original, $more);
}
add_filter('time_formats', 'add_time_format');
function add_time_format($original) {
$more = array('H:i:s a');
return array_merge($original, $more);
}
Don’t want those “generator” tags in your source? Add this
remove_action( 'wp_head', 'wp_generator' );
To modify the output, you can run in through a filter. In this case, the modification is removal.
add_filter('the_generator', 'remove_generated_by');
function remove_generated_by($footer_text) {
return '';
}
If you want to be more specific about where the generator tags are are removed, you can change the filter to something like on of these
add_filter('get_the_generator_xhtml', 'remove_generated_by');
Just swap ‘xhtml’ for one of the following as needed: html, xhtml, atom, rss2, rdf, comment, export.
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);
}