[site-reviews] Require minimum review length

/**
 * Require that reviews have a minimum of 20 characters (change the number to your desired length)
 * Paste this in your active theme's functions.php file.
 * @param array $rules
 * @return array
 */
add_filter('site-reviews/validation/rules', function ($rules) {
    $rules['content'] = 'required|min:20';
    return $rules;
});