Debug Pending Updates

debug_pending_updates.php

<?php
/* To see this output, add ?debug_updates to the site url and refresh the page */

function debug_pending_updates() {

    // Rough safety nets
    if ( ! is_user_logged_in() || ! current_user_can( 'manage_options' ) ) return;
    if ( ! isset( $_GET['debug_updates'] ) ) return;

    $output = "";

    // Check plugins
    $plugin_updates = get_site_transient( 'update_plugins' );
    if ( $plugin_updates && ! empty( $plugin_updates->response ) ) {
        foreach ( $plugin_updates->response as $plugin => $details ) {
            $output .= "<p><strong>Plugin</strong> <u>$plugin</u> is reporting an available update.</p>";
        }
    }

    // Check themes
    wp_update_themes();
    $theme_updates = get_site_transient( 'update_themes' );
    if ( $theme_updates && ! empty( $theme_updates->response ) ) {
        foreach ( $theme_updates->response as $theme => $details ) {
            $output .= "<p><strong>Theme</strong> <u>$theme</u> is reporting an available update.</p>";
        }
    }

    if ( empty( $output ) ) $output = "No pending updates found in the database.";

    wp_die( $output );
}
add_action( 'init', 'debug_pending_updates' );