It can be very risky to use the built-in theme and plugin editors – especially it you (or your client) don’t really know what you’re doing. Fortunately we can disable that pretty easily.
define( 'DISALLOW_FILE_EDIT', true );
Or, take it a step further and disable update abilities too
define( 'DISALLOW_FILE_MODS', true );
If you work with a lot of PDFs in WordPress, you may find the lack of a “view PDFs” link annoying, especially considering that you can separate image and audio attachments easily.
Fortunately, you can fix that.
add_filter('post_mime_types', 'add_post_mime_type');
function add_post_mime_type( $post_mime_types ) {
//$post_mime_types['application'] = array(__('Doc'), __('Manage Doc'), _n_noop('Doc <span class="count">(%s)</span>', 'Doc <span class="count">(%s)</span>'));
$post_mime_types['application/pdf'] = array(__('PDF'), __('Manage PDF'), _n_noop('PDF <span class="count">(%s)</span>', 'PDF <span class="count">(%s)</span>'));
$post_mime_types['application/msword'] = array(__('DOC'), __('Manage DOC'), _n_noop('DOC <span class="count">(%s)</span>', 'DOC <span class="count">(%s)</span>'));
return $post_mime_types;
}
If you need to remove an item from the Admin Bar, it turns out that’s pretty easy too.
add_action( 'admin_bar_menu', 'remove_admin_bar_menu', 70 );
function remove_admin_bar_menu( $wp_admin_bar ) {
$wp_admin_bar->remove_menu( 'widgets' );
}
It can be really useful to add some custom links to the Admin Bar. Like, perhaps to the hidden-yet-awesome options.php page.
add_action( 'admin_bar_menu', 'additional_admin_bar_menu', 70 );
function additional_admin_bar_menu( $wp_admin_bar ) {
if ( current_user_can('manage_options') )
$wp_admin_bar->add_menu( array( 'id' => 'all-settings', 'title' => __('All Settings'), 'href' => admin_url('options.php') ) );
}
If you want to add a sub-menu item, you must add a “parent” parameter, and its value should match the ID of the parent element.
add_action( 'admin_bar_menu', 'additional_admin_bar_menu_child', 70 );
function additional_admin_bar_menu_child( $wp_admin_bar ) {
$wp_admin_bar->add_menu( array( 'parent' => 'all-settings', 'id' => 'google', 'title' => __('Google'), 'href' => 'http://google.com' ) );
}
It’s very easy to override the user-selected rich edit setting. Whether they’ve selected to show it or hide it, it can be reversed in a single line of code:
Always show:
add_filter( 'user_can_richedit', '__return_true' );
Always hide:
add_filter( 'user_can_richedit', '__return_false' );
Of course, if you’re going to overwrite this setting, it would make sense to also hide the user’s checkbox for this option.
add_action( 'admin_print_styles-profile.php', 'hide_rich_edit_option' );
add_action( 'admin_print_styles-user-edit.php', 'hide_rich_edit_option' );
function hide_rich_edit_option() {
?><style type="text/css">
label[for=rich_editing] input { display: none; }
label[for=rich_editing]:before { content: 'This option has been disabled (Formerly: ' }
label[for=rich_editing]:after { content: ')'; }
</style><?php
}
You can probably remove it more fully with Javascript, but I’ll leave that up to you.
If you want to add something to the <title>, without adding to the blog title, you can directly change that with a few lines of code:
add_filter( 'wp_title', 'append_to_title', 10, 3 );
function append_to_title( $title, $sep, $seplocation ) {
return $title .= "OMGBBQFTW $sep ";
}
If you want to change the output of anything the get_bloginfo() returns, there’s a couple of filters that make it simple:
(I’m going to leave the practical application brainstorming up to you)
For text:
add_filter( 'bloginfo', 'be_excited', 10, 2 );
function be_excited( $output, $show ) {
if ( 'name' == $show )
$output .= ' OMG BBQ!!! FTW';
return $output;
}
For URLs: change the filter hook to bloginfo_url
Very similar to a previous post about the “Log In” links, but for the “Register” link. If you think your users would be more comfortable with different verbiage, then make your users comfortable:
add_filter( 'register', 'reg2sign' );
function reg2sign( $link ) {
$link = str_replace( '>Register<', '>Sign Up<', $link );
return $link;
}
Relevant for WordPress 4.4: https://core.trac.wordpress.org/ticket/35103
If you’ve created a login page that isn’t at /wp-login.php, here’s a simple way you can redirect users who click on the “Log In” links to your new page:
add_filter( 'login_url', 'new_login_url', 10, 2 );
function new_login_url( $login_url, $redirect ) {
return '/log-in/';
}
If you’re using the handy wp_login_form() function to create a custom log in page, you may have noticed that you don’t get the “Lost Password?” link. Doesn’t take much to add it back:
add_action( 'login_form_middle', 'add_lost_password_link' );
function add_lost_password_link() {
return '<a href="/wp-login.php?action=lostpassword">Lost Password?</a>';
}