Enable WordPress debugging

enable_wp_debugging.php

// Source: https://www.smashingmagazine.com/2011/03/ten-things-every-wordpress-plugin-developer-should-know/
// Replace `define('WP_DEBUG', false);` in `wp-config.php` with the following lines:

// Turns WordPress debugging on
define('WP_DEBUG', true);

// Tells WordPress to log everything to the /wp-content/debug.log file
define('WP_DEBUG_LOG', true);

// Doesn't force the PHP 'display_errors' variable to be on
define('WP_DEBUG_DISPLAY', false);

// Hides errors from being displayed on-screen
@ini_set('display_errors', 0);