Admin Notice is a very simple plugin that allows you to display custom notices in the WordPress admin that is visible to all users.

Control over the notice text and styling is available from the plugin's settings page.

Developers can use the admin_notice_enable hook to control the notice's visibility on a more granular level. The following example demonstrates how to show the notice only in the "Posts" area of the admin.

add_filter('admin_notice_enable', function($enabled) {

    $screen = get_current_screen();

    if (isset($screen->post_type) && $screen->post_type !== 'post') {
        $enabled = false;
    }

    return $enabled;

}, 10, 1);

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1.2

• Enhancement: Adds admin_notice_enable filter. Thanks to @sevans917 for the feature request!

1.1

• Enhancement: Renames notice styles to be in line with WordPress admin notice classes.
• Security: Much better input sanitization added.
• Tweak: Removes old (ugly) notice styles in favor of default WordPress styles.
• Tweak: Moves plugin settings page to the Settings menu.
• Tweak: Plugin now cleans up its database options on uninstall.
• Tweak: Major code refactoring.

1.0

• First version of the plugin

1. Upload admin-notice to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Plugin options will be available under Settings → Admin Notice

Creating your admin notice