wp-config DEBUG

enviro-switch.php

switch($_SERVER['HTTP_HOST']) {
	case 'wp.sandbox:81':
		define('DB_NAME', 'YOURDB');/** The name of the database for WordPress */
		define('DB_USER', 'YOURUSER');/** MySQL database username */
		define('DB_PASSWORD', 'YOURPASS');/** MySQL database password */
		define('DB_HOST', 'localhost');/** MySQL hostname */ // may need to use actual computer ip in some cases
		break;
	default:
		define('DB_NAME', 'YOURDB');/** The name of the database for WordPress */
		define('DB_USER', 'YOURUSER');/** MySQL database username */
		define('DB_PASSWORD', 'YOURPASS');/** MySQL database password */
		define('DB_HOST', 'localhost');/** MySQL hostname */ // may need to use actual computer ip in some cases
		break;
}

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8mb4');
/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

wp-config-debug.php

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

// http://fuelyourcoding.com/simple-debugging-with-wordpress/
if(!function_exists('_log')):
function _log( $message ) {
	$message = func_get_args();
	if( WP_DEBUG !== true ) return;
	
	$e = new Exception();
	$backtrace =  str_replace(getcwd(), '', $e->getTraceAsString());
	// do we print the whole backtrace?  or just the first line
	if($message[0] !== 'backtrace') $backtrace =  explode("\n"/*PHP_EOL*/, $backtrace)[0];
	error_log(sprintf('DEBUG AT: %s%s%s'
				, $backtrace
				, PHP_EOL
				, print_r( count($message) == 1 ? $message[0] : $message, true )
			));
}
endif;