|null $arr A sequential object array whose unique items are needed
     * @return object[] An array of unique objects
     * @since 1.11.0
     */
    public static function arrayUniqueObject(?array $arr): array {
        if ($arr === null || !$arr) return [];

        $idArray = [];
        foreach($arr as $item) {
            if (!is_object($item)) continue;

            // spl_object_id is a unique ID given to each object. So, the ID array can only have unique objects since
            // unique IDs are used as keys. If an object has the same ID as an object existing in the ID array, then
            // it will just be reassigned. So, ID array is unique.
            $idArray[spl_object_id($item)] = $item;
        }

        // Just return the values of the ID array as the final unique array.
        return array_values($idArray);
    }

    /**
     * Check if a plugin is currently active. This method is created by examining {@link is_plugin_active()} and
     * {@link is_plugin_active_for_network()}. These functions are available in "admin_init" event, while this method
     * is available any time.
     *
     * @param string|null $plugin Path of the plugin's entrypoint file relative to the "plugins" directory. For
     *                            example, for WooCommerce, this is "woocommerce/woocommerce.php".
     * @return bool
     * @since 1.11.0
     */
    public static function isPluginActive(?string $plugin): bool {
        if (!$plugin) return false;

        // If this is not a multi site
        if (!is_multisite()) {
            return in_array($plugin, apply_filters('active_plugins', get_option('active_plugins')));
        }

        // This is a multi site installation. Get site-wide active plugins.
        $activePlugins = get_site_option('active_sitewide_plugins');

        // Make sure it is an array, since the return type does not guarantee that.
        return !is_array($activePlugins)
            ? false
            : in_array($plugin, array_keys($activePlugins));
    }

    /**
     * @return array|string[] Decimal separator options that can be shown in a select form item
     * @since 1.11.0
     */
    public static function getDecimalSeparatorOptionsForSelect(): array {
        return [
            'dot'   => _wpcc('Dot') . ' (.)',
            'comma' => _wpcc('Comma') . ' (,)',
        ];
    }

    /**
     * Check if an array has non-empty values. This does not check inner arrays.
     *
     * @param array $arr An array
     * @return bool True if the array has values that are non-empty
     * @since 1.11.0
     */
    public static function hasNonEmptyValues(array $arr): bool {
        return !empty(array_filter($arr, function($v) {
            if (is_array($v) || is_object($v)) {
                return !empty($v);
            }

            return $v !== '';
        }));
    }

    /**
     * Shifts the first key from a dot key. The dot key will be set to the remaining key after this operation. The first
     * key will be returned. The remaining key, i.e. the value of $dotKey, will be an empty string if the given $dotKey
     * has only one part.
     *
     * @param string|null $dotKey    A dot notation key
     * @param string      $separator The separator used in the dot key. This is typically '.'
     * @return string|null First key. If the dotKey is null or an empty string, returns null. If the dot key could not
     *                     be separated by using the given separator, returns null.
     * @since 1.11.1
     */
    public static function shiftFirstKey(?string &$dotKey, string $separator = '.'): ?string {
        if ($dotKey === null || $dotKey === '') {
            return null;
        }

        // Explode the dot key from the separators. Set the limit as 2 since we need the first key and the rest of the
        // dot key.
        $exploded = explode($separator, $dotKey, 2);
        if ($exploded) {
            // Get the first key
            $firstKey = $exploded[0];

            // The remaining dot key should be in the index 1.
            $dotKey = $exploded[1] ?? '';
            return $firstKey;
        }

        return null;
    }

    /**
     * Get the details of attachments with their IDs
     *
     * @param string[]|int[]|null $attachmentIds IDs of the attachments whose information is needed
     * @return array<int, array>|null An array whose keys are attachment IDs and whose values are the information about
     *                                the attachments retrieved via {@link wp_prepare_attachment_for_js()}.
     * @since 1.12.0
     */
    public static function getAttachmentInfo(?array $attachmentIds): ?array {
        if (!$attachmentIds) return null;

        $preparedIds = array_filter(array_map(function($value) {
            return is_numeric($value)
                ? (int) $value
                : null;
        }, $attachmentIds));

        // Get the attachments
        $attachments = get_posts([
            'numberposts' => -1,
            'orderby'     => 'post__in',
            'include'     => $preparedIds,
            'post_status' => 'any',
            'post_type'   => 'attachment',
        ]);

        // Prepare the attachment details
        $result = [];
        foreach($attachments as $attachment) {
            if (!($attachment instanceof WP_Post)) continue;

            $info = wp_prepare_attachment_for_js($attachment) ?: null;
            if (!is_array($info)) continue;

            $result[$attachment->ID] = $info;
        }

        return $result;
    }
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WPCCrawler\Utils' not found in /home/healths/public_html/wp-content/plugins/wp-content-crawler/app/RequirementValidator.php:58
Stack trace:
#0 /home/healths/public_html/wp-content/plugins/wp-content-crawler/app/WPCCrawler.php(58): WPCCrawler\RequirementValidator-&gt;validateAll()
#1 /home/healths/public_html/wp-content/plugins/wp-content-crawler/app/WPCCrawler.php(44): WPCCrawler\WPCCrawler-&gt;__construct()
#2 /home/healths/public_html/wp-content/plugins/wp-content-crawler/wp-content-crawler.php(28): WPCCrawler\WPCCrawler::getInstance()
#3 /home/healths/public_html/wp-settings.php(473): include_once('/home/healths/p...')
#4 /home/healths/public_html/wp-config.php(99): require_once('/home/healths/p...')
#5 /home/healths/public_html/wp-load.php(50): require_once('/home/healths/p...')
#6 /home/healths/public_html/wp-blog-header.php(13): require_once('/home/healths/p...')
#7 /home/healths/public_html/index.php(17): require('/home/healths/p...')
#8 {main}
  thrown in <b>/home/healths/public_html/wp-content/plugins/wp-content-crawler/app/RequirementValidator.php</b> on line <b>58</b><br />