| PhabricatorUser | $viewer | Current viewer. | 
| PhabricatorUser | Current viewer. | 
| AphrontRequest | $request | The incoming request. | 
| string | $key | The key to examine. | 
| bool | True if a readable value is present in the request. | 
| AphrontRequest | $request | The incoming request. | 
| string | $key | The key to examine. | 
| wild | Value, or default if value is not present. | 
| wild | Default value for this type. | 
| list<string> | Human-readable list of acceptable formats. | 
| list<string> | Human-readable list of format examples. | 
| AphrontHTTPParameterType | $type | The other type. | 
| AphrontRequest | $request | Incoming request. | 
| string | $key | Key to examine. | 
| bool | True if the parameter exists. | 
| AphrontHTTPParameterType | $type | The other type. | 
| AphrontRequest | $request | Incoming request. | 
| string | $key | Key to examine. | 
| list<AphrontHTTPParameterType> | List of all available types. | 
| AphrontRequest | $request | The incoming request. | 
| string | $key | The key to examine. | 
| bool | True if a readable value is present in the request. | 
| AphrontRequest | $request | The incoming request. | 
| string | $key | The key to examine. | 
| list<string> | Human-readable list of acceptable formats. | 
| list<string> | Human-readable list of format examples. | 
This method is not documented.