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.