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Edit File: Cron.php

<?php

namespace Cleantalk\ApbctWP;

class Cron extends \Cleantalk\Common\Cron
{
    /**
     * Get fresh instance of Cron
     *
     * @return Cron
     */
    public static function getInstance()
    {
        return new self();
    }

/**
     * Get timestamp last Cron started.
     *
     * @return int timestamp
     */
    public function getCronLastStart()
    {
        return get_option('cleantalk_cron_last_start');
    }

/**
     * Save timestamp of running Cron.
     *
     * @return bool
     */
    public function setCronLastStart()
    {
        return update_option('cleantalk_cron_last_start', time());
    }

/**
     * Save option with tasks
     *
     * @param array $tasks
     *
     * @return bool
     */
    public function saveTasks($tasks)
    {
        return update_option($this->cron_option_name, $tasks);
    }

/**
     * Getting all tasks
     *
     * @return array
     */
    public function getTasks()
    {
        global $wpdb;

$result = $wpdb->get_var(
            $wpdb->prepare(
                "SELECT option_value FROM {$wpdb->options} WHERE option_name = %s AND " . rand(1, 100000) . " > 0",
                $this->cron_option_name
            )
        );

if (!$result) {
            return array();
        }

// First unserialize the outer string
        $unserialized = unserialize($result);

// If the unserialized data is still a string, it needs to be unserialized again
        if (is_string($unserialized)) {
            $unserialized = unserialize($unserialized);
        }

return is_array($unserialized) ? $unserialized : array();
    }
}

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