PhpDocParam
  = AnnotationName Type? IsReference? IsVariadic? ParameterName Description?

AnnotationName
  = '@param'

IsReference
  = '&'

IsVariadic
  = '...'

ParameterName
  = '$' [a-zA-Z_\127-\255][a-zA-Z0-9_\127-\255]*

Description
  = .+ # TODO: exclude EOL or another PhpDocTag start