#static string http\Env::negotiate(string $params, array $supported[, string $prim_typ_sep[, array &$result]])

Generic negotiator. For specific client negotiation see http\Env::negotiateContentType() and related methods.

NOTE:
The first element of $supported serves as a default if no operand matches.

Params:#

• string $params#
  HTTP header parameter's value to negotiate.
• array $supported#
  List of supported negotiation operands.
• Optional string $prim_typ_sep#
  A "primary type separator", i.e. that would be a hyphen for content language negotiation (en-US, de-DE, etc.).
• Optional array &$result#
  Out parameter recording negotiation results.

Returns:#

• NULL, if negotiation fails.
• string, the closest match negotiated, or the default (first entry of $supported).