Plugin could not be activated because it triggered a fatal error

Product Support WordPress
16

This is the best solution. Even if it’s a simple change to allow support for PHP 5.3, it’s a really bad idea to encourage any usage of it whatsoever.

PHP 5.3 has been unsupported for over 2 years. PHP 5.5 is EOL. PHP 5.6 support ends in 1 month.