## Params:
-* ```array $supported```
+* array $supported
List of supported content character sets.
-* Optional reference ```array &$result```
+* Optional reference array &$result
Out parameter recording negotiation results.
## Returns:
-* ```NULL```, if negotiation fails.
-* ```string```, the negotiated character set.
+* NULL, if negotiation fails.
+* string, the negotiated character set.