# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`FRIBIDI_CHARSET_UTF8` (integer)
  Unicode
`FRIBIDI_CHARSET_8859_6` (integer)
  Arabic
`FRIBIDI_CHARSET_8859_8` (integer)
  Hebrew
`FRIBIDI_CHARSET_CP1255` (integer)
  Hebrew/Yiddish
`FRIBIDI_CHARSET_CP1256` (integer)
  Arabic
`FRIBIDI_CHARSET_ISIRI_3342` (integer)
  Persian
`FRIBIDI_CHARSET_CAP_RTL` (integer)
  Used for test purposes, will treat CAPS as non-English letters
`FRIBIDI_RTL` (integer)
  Right to left
`FRIBIDI_LTR` (integer)
  Left to right
`FRIBIDI_AUTO` (integer)
  Autodetect the base direction