预定义常量

INTL_MAX_LOCALE_LEN ( integer)

Limit on locale length, set to 80 in PHP code. Locale names longer than this limit will not be accepted.

IDNA_DEFAULT ( integer)

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 ( integer)

Allow processing of unassigned codepoints in the input for IDN functions.

IDNA_USE_STD3_RULES ( integer)

Check if the input for IDN functions conforms to domain name ASCII rules.

IDNA_CHECK_BIDI ( integer)

Check whether the input conforms to the BiDi rules. Ignored by the IDNA2003 implementation, which always performs this check.

IDNA_CHECK_CONTEXTJ ( integer)

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 ( integer)

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 ( integer)

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 ( integer)

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 ( integer)

Use UTS #46 algorithm in idn_to_utf8() and idn_to_ascii(). Available as of ICU 4.6.

IDNA_ERROR_EMPTY_LABEL ( integer)

IDNA_ERROR_LABEL_TOO_LONG ( integer)

IDNA_ERROR_DOMAIN_NAME_TOO_LONG ( integer)

IDNA_ERROR_LEADING_HYPHEN ( integer)

IDNA_ERROR_TRAILING_HYPHEN ( integer)

IDNA_ERROR_HYPHEN_3_4 ( integer)

IDNA_ERROR_LEADING_COMBINING_MARK ( integer)

IDNA_ERROR_DISALLOWED ( integer)

IDNA_ERROR_PUNYCODE ( integer)

IDNA_ERROR_LABEL_HAS_DOT ( integer)

IDNA_ERROR_INVALID_ACE_LABEL ( integer)

IDNA_ERROR_BIDI ( integer)

IDNA_ERROR_CONTEXTJ ( integer)

Errors reported in a bitset returned by the UTS #46 algorithm in idn_to_utf8() and idn_to_ascii().