The "Unknown:"s below indicate that an entry is incomplete.

• either the entry exist in the language, and please tell.
• either the entry doesn't exist in the language, and please tell so. The entry will be marked as such and won't appear as missing anymore.

• Various

  #	commenting (until end of line)
  case-sensitive	tokens (case-sensitivity (keywords, variable identifiers...))

• Strings

  '...'	strings (with no interpolation of variables)
  "..."	strings (with no interpolation of variables)
  str	type name

• Booleans

  false	false value
  n	false value
  no	false value
  off	false value
  true	true value
  y	true value
  yes	true value
  on	true value
  bool	type name

• Bags and Lists

  [ a, b, c ](1)	list constructor
  - a - b - c	list constructor
  seq	type name

• Various Data Types

  { a: b, c: d }	dictionary (constructor)
  a: b c: d	dictionary (constructor)
  map	dictionary (type name)
  (empty) / ~ / null	optional value (null value)

• Mathematics

  float	type name (floating point)
  int	type name (integers)

Remarks

• (1) new in PHP 5.4