Causes WordPress to go blank

Used with WordPress 4.3.1 and PHP 4.2. Diff function used in widget was implemented in PHP 4.3. Changed PHP version to 4.3 and entire blog went blank. Also tested on PHP 4.4 and 4.5 with the same blank results. Moved the wp-content/plugins to a temp folder and blog returned. Moved all plugins except this one back to wp-content/plugins folder and blog still functioned. As soon as I moved this plugin back to wp-contents/plugins folder the entire blog went blank again. There must be a bug in the PHP code for this plugin. I didn’t take the time to track down any error messages since this plugin hasn’t been updated in 2 years.

https://wordpress.org/plugins/kid-info-widget/