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    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().

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    User Contributed Notes 2 notes

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    PHP Guru
    4 years ago
    idn_to_ascii('faß.de');

    will return fass.de
    (Due to Germans using the ß symbol as a contraction of ss)

    idn_to_ascii('faß.de', IDNA_NONTRANSITIONAL_TO_ASCII);

    will return xn--fa-hia.de
    (This is the correct behavior too allow faß.de and fass.de to be registered as different domain names.)

    idn_to_utf8('xn--fa-hia.de');

    will return fass.de

    idn_to_utf8('xn--fa-hia.de', IDNA_NONTRANSITIONAL_TO_UNICODE);

    will return faß.de
    (Again this is the correct behavior.)
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    1
    rg at mejoramos dot com
    1 year ago
    to date (MARCH 2023), the version Spanish not give info about the constant `INTL_ICU_VERSION`, take a look to English version, with details about the important constant `INTL_ICU_VERSION`
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