opencart clear cache

CodCache.php

<?php

/**
 *
 */
class CodCache {
    /**
     * @var
     */
    private $registry;
    /**
     * @var
     */
    private $db;

    /**
     * @var true
     */
    private $isCreatedDb;

    /**
     * @param $registry
     */
    public function __construct($registry)
    {
        $this->registry = $registry;
        $this->db = $registry->get('db');

        if (!$this->isCreatedDb){
            $this->createTable();
            $this->isCreatedDb = true;
        }

    }

    /**
     * @param $key
     * @return void
     */
    public function clear($key){

            if ($key == 'system') {
                $dir = DIR_CACHE;
            } elseif ($key == 'modification') {

                $dir = DIR_MODIFICATION;
            } elseif ($key == 'image') {
                $dir = DIR_IMAGE . 'cache/';
            } else {
                $dir = false;
            }



            if ($dir) {
                $files = array();

                // Make path into an array
                $path = array($dir . '*');

                // While the path array is still populated keep looping through
                while (count($path) != 0) {
                    $next = array_shift($path);

                    foreach (glob($next) as $file) {
                        // If directory add to path array
                        if (is_dir($file)) {
                            $path[] = $file . '/*';
                        }

                        // Add the file to the files to be deleted array
                        $files[] = $file;
                    }
                }

                // Reverse sort the file array
                rsort($files);

                // Clear all files
                foreach ($files as $file) {
                    if ($file != $dir . 'index.html' && $file != $dir . '.htaccess') {
                        // If file just delete
                        if (is_file($file)) {
                            unlink($file);

                            // If directory use the remove directory function
                        } elseif (is_dir($file)) {
                            rmdir($file);
                        }
                    }
                }


            }
    }

    /**
     * @return void
     */
    public function clearIfOneC(){
        $sql = $this->db->query("SELECT * FROM `twu_one_c` WHERE name='is_update' LIMIT 1");

        if($sql->row && $sql->row['value'] == 0){
            return false;
        }

       $this->clear('image');
       $this->clear('system');
       $this->setIsUpdate();

    }

    /**
     * @return void
     */
    private function setIsUpdate(){
        $this->db->query("
             UPDATE `twu_one_c` SET            
            `name` = 'is_update',
            `value` = '0'       
            WHERE `name` = 'is_update';
        ");
    }

    /**
     * @return void
     */
    private function createTable(){

        $sqlIsTable = $this->db->query("SHOW TABLES LIKE 'twu_one_c'");

        if ($sqlIsTable->row) return;

        $sql = "
        CREATE TABLE `twu_one_c` (
          `id` int NOT NULL AUTO_INCREMENT PRIMARY KEY,
          `name` char(255) COLLATE 'utf8mb4_general_ci' NULL,
          `value` text(1000) COLLATE 'utf8mb4_general_ci' NOT NULL,
          `update_at` timestamp NULL ON UPDATE CURRENT_TIMESTAMP
        ) ENGINE='InnoDB' COLLATE 'utf8mb4_general_ci';     

        ";

        $this->db->query($sql);

        $sqlIsTableNew = $this->db->query("SHOW TABLES LIKE 'twu_one_c2'");
        if ($sqlIsTableNew->row) {
            $this->db->query(" 
            INSERT INTO `twu_one_c` (`id`, `name`, `value`)
            VALUES ('1', 'is_update', '0');
        ");
        }

    }

}