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Filename : SingletonAbstract.php
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<?php

/**
 * PHP Antimalware Scanner.
 *
 * @author Marco Cesarato <cesarato.developer@gmail.com> * @license http://opensource.org/licenses/gpl-3.0.html GNU Public License
 *
 * @see https://github.com/marcocesarato/PHP-Antimalware-Scanner
 */

namespace AMWScan\Abstracts;

abstract class SingletonAbstract
{
    protected static $instance;

    /**
     * Returns the *Singleton* instance of this class.
     *
     * @return self
     */
    public static function getInstance()
    {
        if (static::$instance === null) {
            $static = new static();
        }

        return $static;
    }

    /**
     * Protected constructor to prevent creating a new instance of the
     * *Singleton* via the `new` operator from outside of this class.
     */
    protected function __construct()
    {
    }

    /**
     * Private clone method to prevent cloning of the instance of the
     * *Singleton* instance.
     *
     * @return void
     */
    private function __clone()
    {
    }

    /**
     * Private unserialize method to prevent unserializing of the *Singleton*
     * instance.
     *
     * @return void
     */
    public function __wakeup()
    {
    }
}