Can you solve this Parse error for Package.php?

Can anyone help me solve this Parse error?? Or provide me with the correct code that I can upload?

Parse error: syntax error, unexpected ‘[‘ in /public_html/wp-content/plugins/wpd-bb-additions/vendor/smarterdigital/wpd-toolset/package/src/Package.php on line 10

See coding below:

<?php

namespace WPD\Toolset;

class Package
{
/**
* @var array
*/
protected static $config = [‘plugin_text_domain’ => ‘wpd-toolset’];

/**
* @param array $config
*/
public function __construct(array $config = [])
{
$this->setConfig($config);
$this->setup();
}

/**
* @param array $config
*/
protected function setup(array $config = []) {

}

/**
*
*/
public function getConfig()
{
return (object) self::$config;
}

/**
* @param array $config
*/
protected function setConfig(array $config = [])
{
$default = (array) self::$config;
self::$config = (object) array_merge($default, $config);
}

/**
* Magic method to check the loaded object property status.
*
* @param string $key
*
* @return bool
*/
// public function __isset($key)
// {
// if (null === $this->__get($key)) {
// return false;
// }
//
// return true;
// }

/**
* Magic method to get the loaded object property.
*
* @param string $prop
*
* @return mixed
*/
// public function __get($prop)
// {
// if ($prop === ‘config’) {
// if (isset(self::$prop) && is_array(self::$prop)) {
// return (object) self::$prop;
// }
//
// return self::$prop;
// }
//
// return null;
// }

/**
* Temporary downgrade
*
* @return string
*/
public static function get_class() {
return __CLASS__;
}
}