Predefined Constants

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- Predefined Constants

# Predefined Constants

`INTL_ICU_VERSION` (string)
  The current ICU library version as a dotted-decimal string.
`INTL_MAX_LOCALE_LEN` (int)
  Limit on locale length, set to 80 in PHP code. Locale names longer than this limit will not be accepted.
`IDNA_DEFAULT` (int)
  Prohibit processing of unassigned codepoints in the input for IDN functions and do not check if the input conforms to domain name ASCII rules.
`IDNA_ALLOW_UNASSIGNED` (int)
  Allow processing of unassigned codepoints in the input for IDN functions.
`IDNA_USE_STD3_RULES` (int)
  Check if the input for IDN functions conforms to domain name ASCII rules.
`IDNA_CHECK_BIDI` (int)
  Check whether the input conforms to the BiDi rules. Ignored by the IDNA2003 implementation, which always performs this check.
`IDNA_CHECK_CONTEXTJ` (int)
  Check whether the input conforms to the CONTEXTJ rules. Ignored by the IDNA2003 implementation, as this check is new in IDNA2008.
`IDNA_NONTRANSITIONAL_TO_ASCII` (int)
  Option for nontransitional processing in idn_to_ascii(). Transitional processing is activated by default. This option is ignored by the IDNA2003 implementation.
`IDNA_NONTRANSITIONAL_TO_UNICODE` (int)
  Option for nontransitional processing in idn_to_utf8(). Transitional processing is activated by default. This option is ignored by the IDNA2003 implementation.
`INTL_IDNA_VARIANT_2003` (int)
  Use IDNA 2003 algorithm in idn_to_utf8() and idn_to_ascii(). This is the default. This constant and using the default has been deprecated as of PHP 7.2.0.
`INTL_IDNA_VARIANT_UTS46` (int)
  Use UTS #46 algorithm in idn_to_utf8() and idn_to_ascii(). Available as of ICU 4.6.
`IDNA_ERROR_EMPTY_LABEL` (int)
`IDNA_ERROR_LABEL_TOO_LONG` (int)
`IDNA_ERROR_DOMAIN_NAME_TOO_LONG` (int)
`IDNA_ERROR_LEADING_HYPHEN` (int)
`IDNA_ERROR_TRAILING_HYPHEN` (int)
`IDNA_ERROR_HYPHEN_3_4` (int)
`IDNA_ERROR_LEADING_COMBINING_MARK` (int)
`IDNA_ERROR_DISALLOWED` (int)
`IDNA_ERROR_PUNYCODE` (int)
`IDNA_ERROR_LABEL_HAS_DOT` (int)
`IDNA_ERROR_INVALID_ACE_LABEL` (int)
`IDNA_ERROR_BIDI` (int)
`IDNA_ERROR_CONTEXTJ` (int)
  Errors reported in a bitset returned by the UTS #46 algorithm in idn_to_utf8() and idn_to_ascii().