Quick Find Box in the Admin Bar

add_action( 'admin_bar_menu', function ( $admin_bar ) {
    if ( ! is_admin() || ! current_user_can( 'edit_posts' ) ) {
        return;
    }

    $form = '<form action="' . esc_url( admin_url( 'admin-post.php' ) ) . '" method="get" style="display:flex;gap:4px;align-items:center;height:32px">'
        . '<input type="hidden" name="action" value="wpide_quick_find">'
        . '<input type="hidden" name="_wpnonce" value="' . esc_attr( wp_create_nonce( 'wpide_quick_find' ) ) . '">'
        . '<label class="screen-reader-text" for="wpide-quick-find">Find</label>'
        . '<input id="wpide-quick-find" name="wpide_q" type="search" placeholder="Find or ID..." style="height:24px;min-height:24px;line-height:1;padding:0 6px;width:150px;font-size:13px">'
        . '<select name="wpide_in" aria-label="Where" style="height:24px;min-height:24px;line-height:1;font-size:12px;padding:0 20px 0 4px">'
        . '<option value="post">Posts</option><option value="page">Pages</option>' . ( current_user_can( 'list_users' ) ? '<option value="users">Users</option>' : '' )
        . '</select></form>';

    $admin_bar->add_node( array(
        'id'     => 'wpide-quick-find',
        'parent' => 'top-secondary',
        'title'  => $form,
        'meta'   => array( 'class' => 'wpide-quick-find' ),
    ) );
}, 100 );

add_action( 'admin_post_wpide_quick_find', function () {
    check_admin_referer( 'wpide_quick_find' );
    $q  = isset( $_GET['wpide_q'] ) ? sanitize_text_field( wp_unslash( $_GET['wpide_q'] ) ) : '';
    $in = isset( $_GET['wpide_in'] ) ? sanitize_key( $_GET['wpide_in'] ) : 'post';

    if ( ctype_digit( $q ) && get_post( (int) $q ) && current_user_can( 'edit_post', (int) $q ) ) {
        wp_safe_redirect( get_edit_post_link( (int) $q, 'url' ) );
        exit;
    }

    $url = 'users' === $in && current_user_can( 'list_users' )
        ? admin_url( 'users.php?s=' . rawurlencode( $q ) )
        : admin_url( 'edit.php?post_type=' . ( 'page' === $in ? 'page' : 'post' ) . '&s=' . rawurlencode( $q ) );

    wp_safe_redirect( $url );
    exit;
} );