:sig
String encode_query(StringMap map)

:params
q : StringMap containing URL parameters to be encoded
return value : a string with the encoded parameters

:see
>uri

:content
Encodes a `StringMap` of URL parameters into a single query-string `String`.

## Related Concepts

- PHP: `http_build_query()`
- JavaScript / Node.js: `URLSearchParams` and `toString()`