Parse error: syntax error, unexpected when try to install

Hello! Very interesting this plugin, I would like to try it in my WP project.
When trying to install, the WordPress says:

Parse error: syntax error, unexpected ‘[‘ in /home/xxxxx-xxxxxxxxxx/www/wp-content/plugins/wp-tripadvisor-review-slider/admin/class-wp-tripadvisor-review-slider-admin.php on line 259

Any idea to solve this error?

If it’s helpful:

WP Version: [?] 4.9.5
PHP Memory Limit: [?] 256 MB
PHP Version: [?] 5.3.10