src/Utils/Str.php
public static function dasherize($value)
    {
        if (isset(self::$dasherized[$value])) {
            return self::$dasherized[$value];
        }

        return self::$dasherized[$value] = str_replace('_', '-', self::decamelize($value));
    }
public static function dasherize($value)
    {
        if (isset(self::$dasherized[$value])) {
            return self::$dasherized[$value];
        }

        return self::$dasherized[$value] = str_replace('_', '-', self::decamelize($value));
    }
Replaces underscores or camel case with dashes.

@param string $value
@return string