Negotiate the header's value against a list of supported values in $supported.
Negotiation operation is adopted according to the header name, i.e. if the
-header being negotiated is ```Accept```, then a slash is used as primary type
-separator, and if the header is ```Accept-Language``` respectively, a hyphen is
+header being negotiated is Accept, then a slash is used as primary type
+separator, and if the header is Accept-Language respectively, a hyphen is
used instead.
-> ***NOTE:*** The first elemement of $supported serves as a default if no operand matches.
+> **Note:** The first elemement of $supported serves as a default if no operand matches.
## Params:
-* ```array $supported```
+* array $supported
The list of supported values to negotiate.
-* Optional reference ```array &$result```
+* Optional reference array &$result
Out parameter recording the negotiation results.
## Returns:
-* ```NULL```, if negotiation fails.
-* ```string```, the closest match negotiated, or the default (first entry of $supported).
+* NULL, if negotiation fails.
+* string, the closest match negotiated, or the default (first entry of $supported).