Code for new button: ‘Check Links Missing TAGS’

I wanted a new button to ‘Check Links Missing TAGS’, same as ‘Check Links Missing Categories’.

I am not a dev or a coder, so I asked Claude. Code provided below, as-is. Feel free to audit or edit as required.

To enable/manage, best to add to your Code-Snippets plugin.

/**
 * Snippet Name: LL Check Links Missing Tags
 * Version:      1.1.0  (2026-04-15)
 * Description:  Adds a 'Check Links Missing Tags' button to the Link Library
 *               link-checking tools page (link-library-reciprocal), mirroring
 *               the 'Check Links Missing Categories' feature.
 *               Uses message=9 on the reciprocal page (unused by core as of v7.8.9).
 */

// ── 1. Inject the button after the emptycatcheck button row ──────────────────
add_action( 'admin_footer', 'll_missing_tags_inject_button' );
function ll_missing_tags_inject_button() {
    $screen = get_current_screen();
    if ( ! $screen || $screen->id !== 'link_library_links_page_link-library-reciprocal' ) {
        return;
    }
    ?>
    <script type="text/javascript">
    jQuery(document).ready(function($){
        var $catBtn = $('input#emptycatcheck').closest('tr');
        if ( $catBtn.length ) {
            $catBtn.after(
                '<tr><td>' +
                '<input class="button" type="submit" id="emptytagcheck" ' +
                'name="emptytagcheck" value="<?php echo esc_js( __( 'Check Links Missing Tags', 'link-library' ) ); ?>" />' +
                '</td></tr>'
            );
        }
    });
    </script>
    <?php
}

// ── 2. Intercept the form post BEFORE the plugin handler (priority 1 vs 10) ──
//    The plugin's nonce action is 'link-library' (wp_nonce_field( 'link-library' )).
//    The plugin uses $_POST['_wp_http_referer'] for the redirect — we must do the same.
add_action( 'admin_post_save_link_library_reciprocal', 'll_missing_tags_intercept_save', 1 );
function ll_missing_tags_intercept_save() {
    if ( ! isset( $_POST['emptytagcheck'] ) ) {
        return; // Not our button — let the plugin handle it at priority 10
    }

    if ( ! current_user_can( 'manage_options' ) ) {
        wp_die( __( 'Not allowed', 'link-library' ) );
    }

    // Match the exact nonce the plugin generates
    check_admin_referer( 'link-library' );

    // Mirror the plugin's own redirect logic exactly
    $redirect_url = remove_query_arg( array( 'message' ), $_POST['_wp_http_referer'] );
    $redirect_url = add_query_arg( 'message', 9, $redirect_url );
    wp_redirect( $redirect_url );
    exit;
}

// ── 3. Display report when message=9 on the reciprocal page ──────────────────
add_action( 'admin_notices', 'll_missing_tags_display_report' );
function ll_missing_tags_display_report() {
    if (
        ! isset( $_GET['page'] )    || $_GET['page'] !== 'link-library-reciprocal' ||
        ! isset( $_GET['message'] ) || intval( $_GET['message'] ) !== 9
    ) {
        return;
    }
    if ( ! current_user_can( 'manage_options' ) ) {
        return;
    }

    $genoptions = get_option( 'LinkLibraryGeneral' );
    $genoptions = wp_parse_args( $genoptions, array( 'tagtaxonomy' => 'link_library_tags' ) );
    $tag_tax    = sanitize_key( $genoptions['tagtaxonomy'] );

    global $wpdb;

    // SQL mirrors link_library_empty_cat_link_checker() with tag taxonomy
    $linkquery  = "SELECT p.ID, p.post_title, pm.meta_value FROM {$wpdb->posts} p ";
    $linkquery .= "JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id ";
    $linkquery .= "WHERE p.post_type = 'link_library_links' ";
    $linkquery .= "AND p.post_status IN ('publish','pending','draft','future','private') ";
    $linkquery .= "AND pm.meta_key = 'link_url' ";
    $linkquery .= "AND NOT EXISTS ( ";
    $linkquery .=   "SELECT 1 FROM {$wpdb->term_relationships} rel ";
    $linkquery .=   "JOIN {$wpdb->term_taxonomy} tax ON tax.term_taxonomy_id = rel.term_taxonomy_id ";
    $linkquery .=   "AND tax.taxonomy = %s ";
    $linkquery .=   "WHERE p.ID = rel.object_id ";
    $linkquery .= ")";

    $links = $wpdb->get_results( $wpdb->prepare( $linkquery, $tag_tax ) );

    echo "<div id='message' class='updated fade'><p>";
    echo "<strong>" . __( 'Links Missing Tags Report', 'link-library' ) . "</strong><br /><br />";

    if ( $links ) {
        foreach ( $links as $link ) {
            $edit_url = esc_url( add_query_arg( array( 'action' => 'edit', 'post' => $link->ID ), admin_url( 'post.php' ) ) );
            echo esc_html( $link->ID ) . ' - ' . esc_html( $link->post_title ) . ': ';
            echo esc_html( $link->meta_value );
            echo ' <a href="' . $edit_url . '">Edit</a><br /><br />';
        }
    } else {
        echo __( 'No links found without tags.', 'link-library' );
    }

    echo '</p></div>';
}