Searches all message parts for the specified MIME types. Returns an array of part ids on success and returns FALSE on failure.
| param | int | &$mid message id |
| param | array | $MIME types to look for |
| return | array|FALSE | |
| throws | ErrorStack: Argument requires array. | The $MIME argument must be an array. |
| throws | ErrorStack: Message structure 'ftype' does not exist. | No message part contains a MIME type. |
| access | public | |