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Predefined Constants

INTL_ICU_DATA_VERSION (string)
Data version in ICU4C.
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.
GRAPHEME_EXTR_COUNT (int)
The number of default grapheme clusters to extract.
GRAPHEME_EXTR_MAXBYTES (int)
The maximum number of bytes returned.
GRAPHEME_EXTR_MAXCHARS (int)
The maximum number of UTF-8 characters returned.

The following errors are part of a bitmask returned by the UTS #46 algorithm in idn_to_utf8() and idn_to_ascii().

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)
ULOC_ACTUAL_LOCALE (int)
The locale the data actually comes from.
ULOC_VALID_LOCALE (int)
The most specific locale supported by ICU.
U_AMBIGUOUS_ALIAS_WARNING (int)
This converter alias can go to different converter implementations.
U_BAD_VARIABLE_DEFINITION (int)
Missing '$' or duplicate variable name.
U_BRK_ASSIGN_ERROR (int)
Syntax error in RBBI rule assignment statement.
U_BRK_ERROR_LIMIT (int)
This must always be the last value to indicate the limit for Break Iterator failures.
U_BRK_ERROR_START (int)
Start of codes indicating Break Iterator failures.
U_BRK_HEX_DIGITS_EXPECTED (int)
Hex digits expected as part of a escaped char in a rule.
U_BRK_INIT_ERROR (int)
Initialization failure. Probable missing ICU Data.
U_BRK_INTERNAL_ERROR (int)
An internal error (bug) was detected.
U_BRK_MALFORMED_RULE_TAG (int)
The {nnn} tag on a rule is mal formed.
U_BRK_MISMATCHED_PAREN (int)
Mis-matched parentheses in an RBBI rule.
U_BRK_NEW_LINE_IN_QUOTED_STRING (int)
Missing closing quote in an RBBI rule.
U_BRK_RULE_EMPTY_SET (int)
Rule contains an empty Unicode Set.
U_BRK_RULE_SYNTAX (int)
Syntax error in RBBI rule.
U_BRK_SEMICOLON_EXPECTED (int)
Missing ';' at the end of a RBBI rule.
U_BRK_UNCLOSED_SET (int)
UnicodeSet writing an RBBI rule missing a closing ']'.
U_BRK_UNDEFINED_VARIABLE (int)
Use of an undefined $Variable in an RBBI rule.
U_BRK_UNRECOGNIZED_OPTION (int)
Option in RBBI rules not recognized.
U_BRK_VARIABLE_REDFINITION (int)
RBBI rule variable redefined.
U_BUFFER_OVERFLOW_ERROR (int)
A result would not fit in the supplied buffer.
U_CE_NOT_FOUND_ERROR (int)
Currently used only while setting variable top, but can be used generally.
U_COLLATOR_VERSION_MISMATCH (int)
Collator version is not compatible with the base version.
U_DIFFERENT_UCA_VERSION (int)
ucol_open encountered a mismatch between UCA version and collator image version, so the collator was constructed from rules. No impact to further function.
U_ENUM_OUT_OF_SYNC_ERROR (int)
UEnumeration out of sync with underlying collection.
U_ERROR_LIMIT (int)
Alias of U_PLUGIN_ERROR_LIMIT.
U_ERROR_WARNING_LIMIT (int)
This must always be the last warning value to indicate the limit for UErrorCode warnings (last warning code +1).
U_ERROR_WARNING_START (int)
Start of information results (semantically successful).
U_FILE_ACCESS_ERROR (int)
The requested file cannot be found.
U_FMT_PARSE_ERROR_LIMIT (int)
The limit for format library errors.
U_FMT_PARSE_ERROR_START (int)
Start of format library errors.
U_IDNA_ACE_PREFIX_ERROR (int)
U_IDNA_CHECK_BIDI_ERROR (int)
U_IDNA_DOMAIN_NAME_TOO_LONG_ERROR (int)
U_IDNA_ERROR_LIMIT (int)
U_IDNA_ERROR_START (int)
U_IDNA_LABEL_TOO_LONG_ERROR (int)
U_IDNA_PROHIBITED_ERROR (int)
U_IDNA_STD3_ASCII_RULES_ERROR (int)
U_IDNA_UNASSIGNED_ERROR (int)
U_IDNA_VERIFICATION_ERROR (int)
U_IDNA_ZERO_LENGTH_LABEL_ERROR (int)
U_ILLEGAL_ARGUMENT_ERROR (int)
Indicates an incorrect argument value.
U_ILLEGAL_CHAR_FOUND (int)
Character conversion: Illegal input sequence.
U_ILLEGAL_CHAR_IN_SEGMENT (int)
Unused as of ICU 2.4.
U_ILLEGAL_CHARACTER (int)
A special character is outside its allowed context.
U_ILLEGAL_ESCAPE_SEQUENCE (int)
ISO-2022 illlegal escape sequence.
U_ILLEGAL_PAD_POSITION (int)
Pad symbol misplaced in number pattern.
U_INDEX_OUTOFBOUNDS_ERROR (int)
Trying to access the index that is out of bounds.
U_INTERNAL_PROGRAM_ERROR (int)
Indicates a bug in the library code.
U_INTERNAL_TRANSLITERATOR_ERROR (int)
Internal transliterator system error.
U_INVALID_CHAR_FOUND (int)
Character conversion: Unmappable input sequence. In other APIs: Invalid character.
U_INVALID_FORMAT_ERROR (int)
Data format is not what is expected.
U_INVALID_FUNCTION (int)
A '&fn()' rule specifies an unknown transliterator.
U_INVALID_ID (int)
A '::id' rule specifies an unknown transliterator.
U_INVALID_PROPERTY_PATTERN (int)
Unused as of ICU 2.4.
U_INVALID_RBT_SYNTAX (int)
A '::id' rule was passed to the RuleBasedTransliterator parser.
U_INVALID_STATE_ERROR (int)
Requested operation can not be completed with ICU in its current state.
U_INVALID_TABLE_FILE (int)
Conversion table file not found.
U_INVALID_TABLE_FORMAT (int)
Conversion table file found, but corrupted.
U_INVARIANT_CONVERSION_ERROR (int)
Unable to convert a UChar* string to char* with the invariant converter.
U_MALFORMED_EXPONENTIAL_PATTERN (int)
Grouping symbol in exponent pattern.
U_MALFORMED_PRAGMA (int)
A 'use' pragma is invalid.
U_MALFORMED_RULE (int)
Elements of a rule are misplaced.
U_MALFORMED_SET (int)
A UnicodeSet pattern is invalid.
U_MALFORMED_SYMBOL_REFERENCE (int)
Unused as of ICU 2.4.
U_MALFORMED_UNICODE_ESCAPE (int)
A Unicode escape pattern is invalid.
U_MALFORMED_VARIABLE_DEFINITION (int)
A variable definition is invalid.
U_MALFORMED_VARIABLE_REFERENCE (int)
A variable reference is invalid.
U_MEMORY_ALLOCATION_ERROR (int)
Memory allocation error.
U_MESSAGE_PARSE_ERROR (int)
Unable to parse a message (message format).
U_MISMATCHED_SEGMENT_DELIMITERS (int)
Unused as of ICU 2.4.
U_MISPLACED_ANCHOR_START (int)
A start anchor appears at an illegal position.
U_MISPLACED_COMPOUND_FILTER (int)
A compound filter is in an invalid location.
U_MISPLACED_CURSOR_OFFSET (int)
A cursor offset occurs at an illegal position.
U_MISPLACED_QUANTIFIER (int)
A quantifier appears after a segment close delimiter.
U_MISSING_OPERATOR (int)
A rule contains no operator.
U_MISSING_RESOURCE_ERROR (int)
The requested resource cannot be found.
U_MISSING_SEGMENT_CLOSE (int)
Unused as of ICU 2.4.
U_MULTIPLE_ANTE_CONTEXTS (int)
More than one ante context.
U_MULTIPLE_COMPOUND_FILTERS (int)
More than one compound filter.
U_MULTIPLE_CURSORS (int)
More than one cursor.
U_MULTIPLE_DECIMAL_SEPARATORS (int)
More than one decimal separator in number pattern.
U_MULTIPLE_DECIMAL_SEPERATORS (int)
Alias of U_MULTIPLE_DECIMAL_SEPARATORS.
U_MULTIPLE_EXPONENTIAL_SYMBOLS (int)
More than one exponent symbol in number pattern.
U_MULTIPLE_PAD_SPECIFIERS (int)
More than one pad symbol in number pattern.
U_MULTIPLE_PERCENT_SYMBOLS (int)
More than one percent symbol in number pattern.
U_MULTIPLE_PERMILL_SYMBOLS (int)
More than one permill symbol in number pattern.
U_MULTIPLE_POST_CONTEXTS (int)
More than one post context.
U_NO_SPACE_AVAILABLE (int)
No space available for in-buffer expansion for Arabic shaping.
U_NO_WRITE_PERMISSION (int)
Attempt to modify read-only or constant data.
U_PARSE_ERROR (int)
Equivalent to Java ParseException.
U_PARSE_ERROR_LIMIT (int)
The limit for Transliterator errors.
U_PARSE_ERROR_START (int)
Start of Transliterator errors.
U_PATTERN_SYNTAX_ERROR (int)
Syntax error in format pattern.
U_PRIMARY_TOO_LONG_ERROR (int)
User tried to set variable top to a primary that is longer than two bytes.
U_REGEX_BAD_ESCAPE_SEQUENCE (int)
Unrecognized backslash escape sequence in pattern.
U_REGEX_BAD_INTERVAL (int)
Error in {min,max} interval.
U_REGEX_ERROR_LIMIT (int)
This must always be the last value to indicate the limit for regexp errors.
U_REGEX_ERROR_START (int)
Start of codes indicating Regexp failures.
U_REGEX_INTERNAL_ERROR (int)
An internal error (bug) was detected.
U_REGEX_INVALID_BACK_REF (int)
Back-reference to a non-existent capture group.
U_REGEX_INVALID_FLAG (int)
Invalid value for match mode flags.
U_REGEX_INVALID_STATE (int)
RegexMatcher in invalid state for requested operation.
U_REGEX_LOOK_BEHIND_LIMIT (int)
Look-Behind pattern matches must have a bounded maximum length.
U_REGEX_MAX_LT_MIN (int)
In {min,max}, max is less than min.
U_REGEX_MISMATCHED_PAREN (int)
Incorrectly nested parentheses in regexp pattern.
U_REGEX_NUMBER_TOO_BIG (int)
Decimal number is too large.
U_REGEX_PROPERTY_SYNTAX (int)
Incorrect Unicode property.
U_REGEX_RULE_SYNTAX (int)
Syntax error in regexp pattern.
U_REGEX_SET_CONTAINS_STRING (int)
Regexps cannot have UnicodeSets containing strings.
U_REGEX_UNIMPLEMENTED (int)
Use of regexp feature that is not yet implemented.
U_RESOURCE_TYPE_MISMATCH (int)
An operation is requested over a resource that does not support it.
U_RULE_MASK_ERROR (int)
A rule is hidden by an earlier more general rule.
U_SAFECLONE_ALLOCATED_WARNING (int)
A SafeClone operation required allocating memory (informational only).
U_SORT_KEY_TOO_SHORT_WARNING (int)
Number of levels requested in getBound is higher than the number of levels in the sort key.
U_STANDARD_ERROR_LIMIT (int)
This must always be the last value to indicate the limit for standard errors.
U_STATE_OLD_WARNING (int)
ICU has to use compatibility layer to construct the service. Expect performance/memory usage degradation.
U_STATE_TOO_OLD_ERROR (int)
ICU cannot construct a service from this state, as it is no longer supported.
U_STRING_NOT_TERMINATED_WARNING (int)
An output string could not be NUL-terminated because output length==destCapacity.
U_STRINGPREP_CHECK_BIDI_ERROR (int)
Alias of U_IDNA_CHECK_BIDI_ERROR.
U_STRINGPREP_PROHIBITED_ERROR (int)
Alias of U_IDNA_PROHIBITED_ERROR.
U_STRINGPREP_UNASSIGNED_ERROR (int)
Alias of U_IDNA_UNASSIGNED_ERROR.
U_TOO_MANY_ALIASES_ERROR (int)
There are too many aliases in the path to the requested resource. It is very possible that a circular alias definition has occurred.
U_TRAILING_BACKSLASH (int)
A dangling backslash.
U_TRUNCATED_CHAR_FOUND (int)
Character conversion: Incomplete input sequence.
U_UNCLOSED_SEGMENT (int)
A closing ')' is missing.
U_UNDEFINED_SEGMENT_REFERENCE (int)
A segment reference does not correspond to a defined segment.
U_UNDEFINED_VARIABLE (int)
A variable reference does not correspond to a defined variable.
U_UNEXPECTED_TOKEN (int)
Syntax error in format pattern.
U_UNMATCHED_BRACES (int)
Braces do not match in message pattern.
U_UNQUOTED_SPECIAL (int)
A special character was not quoted or escaped.
U_UNSUPPORTED_ATTRIBUTE (int)
Unused as of ICU 2.4.
U_UNSUPPORTED_ERROR (int)
Requested operation not supported in current context.
U_UNSUPPORTED_ESCAPE_SEQUENCE (int)
ISO-2022 unsupported escape sequence.
U_UNSUPPORTED_PROPERTY (int)
Unused as of ICU 2.4.
U_UNTERMINATED_QUOTE (int)
A closing single quote is missing.
U_USELESS_COLLATOR_ERROR (int)
Collator is options only and no base is specified.
U_USING_DEFAULT_WARNING (int)
A resource bundle lookup returned a result from the root locale (not an error).
U_USING_FALLBACK_WARNING (int)
A resource bundle lookup returned a fallback result (not an error).
U_VARIABLE_RANGE_EXHAUSTED (int)
Too many stand-ins generated for the given variable range.
U_VARIABLE_RANGE_OVERLAP (int)
The variable range overlaps characters used in rules.
U_ZERO_ERROR (int)
No error, no warning.