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Hide Admin Notices From Non-Administrators

Removes plugin and theme notices, update nags and promotions from the admin for everyone who is not an administrator.

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Code

add_action( 'in_admin_header', function () {
    if ( current_user_can( 'manage_options' ) ) {
        return;
    }

    remove_all_actions( 'admin_notices' );
    remove_all_actions( 'all_admin_notices' );
}, 999 );

Notes

Messages like "Post updated" are not admin notices and keep showing.

How to add this snippet

  1. Install WPIDE on your WordPress site (it is free) and open Code Snippets.
  2. Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
  3. It is added inactive: review the code and settings, then switch it on.

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