Singleton.php

<?php

/**
 * Class: Singleton
 *
 */
class Singleton
{
    /**
     * instance
     *
     * @var mixed
     */
    private static $instance;

    /**
     * name
     *
     * @var mixed
     */
    protected $name;

    /**
     * __construct
     *
     * @param mixed $name
     */
    private function __construct($name)
    {
        $this->name = $name;
    }

    /**
     * getInstance
     *
     * @param mixed $name
     */
    public static function getInstance($name) : Self
    {
        if (!isset(self::$instance)) {
            self::$instance = new Self($name);
        }
        return self::$instance;
    }

    /**
     * getName
     *
     */
    public function getName()
    {
        return $this->name;
    }
}

echo Singleton::getInstance('Cvar1984')->getName(), PHP_EOL;