Pop\Cache\Adapter\Sqlite::__construct PHP Метод

    public function __construct($db, $table = 'pop_cache', $pdo = false)
    {
        $this->db = $db;
        $this->table = $table;
        $dir = dirname($this->db);
        // If the database file doesn't exist, create it.
        if (!file_exists($this->db)) {
            if (is_writable($dir)) {
                touch($db);
            } else {
                throw new Exception('Error: That cache db file and/or directory is not writable.');
            }
        }
        // Make it writable.
        chmod($this->db, 0777);
        // Check the permissions, access the database and check for the cache table.
        if (!is_writable($dir) || !is_writable($this->db)) {
            throw new Exception('Error: That cache db file and/or directory is not writable.');
        }
        $pdoDrivers = class_exists('Pdo') ? \PDO::getAvailableDrivers() : array();
        if (!class_exists('Sqlite3') && !in_array('sqlite', $pdoDrivers)) {
            throw new Exception('Error: SQLite is not available.');
        } else {
            if ($pdo && !in_array('sqlite', $pdoDrivers)) {
                $pdo = false;
            } else {
                if (!$pdo && !class_exists('Sqlite3')) {
                    $pdo = true;
                }
            }
        }
        if ($pdo) {
            $this->sqlite = new \Pop\Db\Sql(\Pop\Db\Db::factory('Pdo', array('type' => 'sqlite', 'database' => $this->db)), $table);
        } else {
            $this->sqlite = new \Pop\Db\Sql(\Pop\Db\Db::factory('Sqlite', array('database' => $this->db)), $table);
        }
        // If the cache table doesn't exist, create it.
        if (!in_array($this->table, $this->sqlite->adapter()->getTables())) {
            $this->sqlite->adapter()->query('CREATE TABLE IF NOT EXISTS "' . $this->table . '" ("id" VARCHAR PRIMARY KEY NOT NULL UNIQUE, "value" BLOB, "time" INTEGER)');
        }
    }