The authoritative source on what these character classes mean is Unicode Standard "Unicode Character Database", documented at https://www.unicode.org/reports/tr44/ (see chapter 5).
(PHP 7, PHP 8)
IntlChar provides access to a number of utility methods that can be used to access information about Unicode characters.
The methods and constants adhere closely to the names and behavior used by the underlying ICU library.
$start
,$end
,$callback
,$type
= IntlChar::UNICODE_CHAR_NAME$codepoint
, int $options
= IntlChar::FOLD_CASE_DEFAULT): int|string|null$property
, int $type
= IntlChar::LONG_PROPERTY_NAME): string|falseIntlChar::UNICODE_VERSION
IntlChar::CODEPOINT_MIN
IntlChar::CODEPOINT_MAX
IntlChar::NO_NUMERIC_VALUE
Special value that is returned by IntlChar::getNumericValue() when no numeric value is defined for a code point.
IntlChar::PROPERTY_ALPHABETIC
IntlChar::PROPERTY_BINARY_START
IntlChar::PROPERTY_ASCII_HEX_DIGIT
IntlChar::PROPERTY_BIDI_CONTROL
IntlChar::PROPERTY_BIDI_MIRRORED
IntlChar::PROPERTY_DASH
IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT
IntlChar::PROPERTY_DEPRECATED
IntlChar::PROPERTY_DIACRITIC
IntlChar::PROPERTY_EXTENDER
IntlChar::PROPERTY_FULL_COMPOSITION_EXCLUSION
IntlChar::PROPERTY_GRAPHEME_BASE
IntlChar::PROPERTY_GRAPHEME_EXTEND
IntlChar::PROPERTY_GRAPHEME_LINK
IntlChar::PROPERTY_HEX_DIGIT
IntlChar::PROPERTY_HYPHEN
IntlChar::PROPERTY_ID_CONTINUE
IntlChar::PROPERTY_ID_START
IntlChar::PROPERTY_IDEOGRAPHIC
IntlChar::PROPERTY_IDS_BINARY_OPERATOR
IntlChar::PROPERTY_IDS_TRINARY_OPERATOR
IntlChar::PROPERTY_JOIN_CONTROL
IntlChar::PROPERTY_LOGICAL_ORDER_EXCEPTION
IntlChar::PROPERTY_LOWERCASE
IntlChar::PROPERTY_MATH
IntlChar::PROPERTY_NONCHARACTER_CODE_POINT
IntlChar::PROPERTY_QUOTATION_MARK
IntlChar::PROPERTY_RADICAL
IntlChar::PROPERTY_SOFT_DOTTED
IntlChar::PROPERTY_TERMINAL_PUNCTUATION
IntlChar::PROPERTY_UNIFIED_IDEOGRAPH
IntlChar::PROPERTY_UPPERCASE
IntlChar::PROPERTY_WHITE_SPACE
IntlChar::PROPERTY_XID_CONTINUE
IntlChar::PROPERTY_XID_START
IntlChar::PROPERTY_CASE_SENSITIVE
IntlChar::PROPERTY_S_TERM
IntlChar::PROPERTY_VARIATION_SELECTOR
IntlChar::PROPERTY_NFD_INERT
IntlChar::PROPERTY_NFKD_INERT
IntlChar::PROPERTY_NFC_INERT
IntlChar::PROPERTY_NFKC_INERT
IntlChar::PROPERTY_SEGMENT_STARTER
IntlChar::PROPERTY_PATTERN_SYNTAX
IntlChar::PROPERTY_PATTERN_WHITE_SPACE
IntlChar::PROPERTY_POSIX_ALNUM
IntlChar::PROPERTY_POSIX_BLANK
IntlChar::PROPERTY_POSIX_GRAPH
IntlChar::PROPERTY_POSIX_PRINT
IntlChar::PROPERTY_POSIX_XDIGIT
IntlChar::PROPERTY_CASED
IntlChar::PROPERTY_CASE_IGNORABLE
IntlChar::PROPERTY_CHANGES_WHEN_LOWERCASED
IntlChar::PROPERTY_CHANGES_WHEN_UPPERCASED
IntlChar::PROPERTY_CHANGES_WHEN_TITLECASED
IntlChar::PROPERTY_CHANGES_WHEN_CASEFOLDED
IntlChar::PROPERTY_CHANGES_WHEN_CASEMAPPED
IntlChar::PROPERTY_CHANGES_WHEN_NFKC_CASEFOLDED
IntlChar::PROPERTY_BINARY_LIMIT
IntlChar::PROPERTY_BIDI_CLASS
IntlChar::PROPERTY_INT_START
IntlChar::PROPERTY_BLOCK
IntlChar::PROPERTY_CANONICAL_COMBINING_CLASS
IntlChar::PROPERTY_DECOMPOSITION_TYPE
IntlChar::PROPERTY_EAST_ASIAN_WIDTH
IntlChar::PROPERTY_GENERAL_CATEGORY
IntlChar::PROPERTY_JOINING_GROUP
IntlChar::PROPERTY_JOINING_TYPE
IntlChar::PROPERTY_LINE_BREAK
IntlChar::PROPERTY_NUMERIC_TYPE
IntlChar::PROPERTY_SCRIPT
IntlChar::PROPERTY_HANGUL_SYLLABLE_TYPE
IntlChar::PROPERTY_NFD_QUICK_CHECK
IntlChar::PROPERTY_NFKD_QUICK_CHECK
IntlChar::PROPERTY_NFC_QUICK_CHECK
IntlChar::PROPERTY_NFKC_QUICK_CHECK
IntlChar::PROPERTY_LEAD_CANONICAL_COMBINING_CLASS
IntlChar::PROPERTY_TRAIL_CANONICAL_COMBINING_CLASS
IntlChar::PROPERTY_GRAPHEME_CLUSTER_BREAK
IntlChar::PROPERTY_SENTENCE_BREAK
IntlChar::PROPERTY_WORD_BREAK
IntlChar::PROPERTY_BIDI_PAIRED_BRACKET_TYPE
IntlChar::PROPERTY_INT_LIMIT
IntlChar::PROPERTY_GENERAL_CATEGORY_MASK
IntlChar::PROPERTY_MASK_START
IntlChar::PROPERTY_MASK_LIMIT
IntlChar::PROPERTY_NUMERIC_VALUE
IntlChar::PROPERTY_DOUBLE_START
IntlChar::PROPERTY_DOUBLE_LIMIT
IntlChar::PROPERTY_AGE
IntlChar::PROPERTY_STRING_START
IntlChar::PROPERTY_BIDI_MIRRORING_GLYPH
IntlChar::PROPERTY_CASE_FOLDING
IntlChar::PROPERTY_ISO_COMMENT
IntlChar::PROPERTY_LOWERCASE_MAPPING
IntlChar::PROPERTY_NAME
IntlChar::PROPERTY_SIMPLE_CASE_FOLDING
IntlChar::PROPERTY_SIMPLE_LOWERCASE_MAPPING
IntlChar::PROPERTY_SIMPLE_TITLECASE_MAPPING
IntlChar::PROPERTY_SIMPLE_UPPERCASE_MAPPING
IntlChar::PROPERTY_TITLECASE_MAPPING
IntlChar::PROPERTY_UNICODE_1_NAME
IntlChar::PROPERTY_UPPERCASE_MAPPING
IntlChar::PROPERTY_BIDI_PAIRED_BRACKET
IntlChar::PROPERTY_STRING_LIMIT
IntlChar::PROPERTY_SCRIPT_EXTENSIONS
IntlChar::PROPERTY_OTHER_PROPERTY_START
IntlChar::PROPERTY_OTHER_PROPERTY_LIMIT
IntlChar::PROPERTY_INVALID_CODE
IntlChar::CHAR_CATEGORY_UNASSIGNED
IntlChar::CHAR_CATEGORY_GENERAL_OTHER_TYPES
IntlChar::CHAR_CATEGORY_UPPERCASE_LETTER
IntlChar::CHAR_CATEGORY_LOWERCASE_LETTER
IntlChar::CHAR_CATEGORY_TITLECASE_LETTER
IntlChar::CHAR_CATEGORY_MODIFIER_LETTER
IntlChar::CHAR_CATEGORY_OTHER_LETTER
IntlChar::CHAR_CATEGORY_NON_SPACING_MARK
IntlChar::CHAR_CATEGORY_ENCLOSING_MARK
IntlChar::CHAR_CATEGORY_COMBINING_SPACING_MARK
IntlChar::CHAR_CATEGORY_DECIMAL_DIGIT_NUMBER
IntlChar::CHAR_CATEGORY_LETTER_NUMBER
IntlChar::CHAR_CATEGORY_OTHER_NUMBER
IntlChar::CHAR_CATEGORY_SPACE_SEPARATOR
IntlChar::CHAR_CATEGORY_LINE_SEPARATOR
IntlChar::CHAR_CATEGORY_PARAGRAPH_SEPARATOR
IntlChar::CHAR_CATEGORY_CONTROL_CHAR
IntlChar::CHAR_CATEGORY_FORMAT_CHAR
IntlChar::CHAR_CATEGORY_PRIVATE_USE_CHAR
IntlChar::CHAR_CATEGORY_SURROGATE
IntlChar::CHAR_CATEGORY_DASH_PUNCTUATION
IntlChar::CHAR_CATEGORY_START_PUNCTUATION
IntlChar::CHAR_CATEGORY_END_PUNCTUATION
IntlChar::CHAR_CATEGORY_CONNECTOR_PUNCTUATION
IntlChar::CHAR_CATEGORY_OTHER_PUNCTUATION
IntlChar::CHAR_CATEGORY_MATH_SYMBOL
IntlChar::CHAR_CATEGORY_CURRENCY_SYMBOL
IntlChar::CHAR_CATEGORY_MODIFIER_SYMBOL
IntlChar::CHAR_CATEGORY_OTHER_SYMBOL
IntlChar::CHAR_CATEGORY_INITIAL_PUNCTUATION
IntlChar::CHAR_CATEGORY_FINAL_PUNCTUATION
IntlChar::CHAR_CATEGORY_CHAR_CATEGORY_COUNT
IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT
IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT
IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER
IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_SEPARATOR
IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_TERMINATOR
IntlChar::CHAR_DIRECTION_ARABIC_NUMBER
IntlChar::CHAR_DIRECTION_COMMON_NUMBER_SEPARATOR
IntlChar::CHAR_DIRECTION_BLOCK_SEPARATOR
IntlChar::CHAR_DIRECTION_SEGMENT_SEPARATOR
IntlChar::CHAR_DIRECTION_WHITE_SPACE_NEUTRAL
IntlChar::CHAR_DIRECTION_OTHER_NEUTRAL
IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_EMBEDDING
IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_OVERRIDE
IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_ARABIC
IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_EMBEDDING
IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_OVERRIDE
IntlChar::CHAR_DIRECTION_POP_DIRECTIONAL_FORMAT
IntlChar::CHAR_DIRECTION_DIR_NON_SPACING_MARK
IntlChar::CHAR_DIRECTION_BOUNDARY_NEUTRAL
IntlChar::CHAR_DIRECTION_FIRST_STRONG_ISOLATE
IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_ISOLATE
IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_ISOLATE
IntlChar::CHAR_DIRECTION_POP_DIRECTIONAL_ISOLATE
IntlChar::CHAR_DIRECTION_CHAR_DIRECTION_COUNT
IntlChar::BLOCK_CODE_NO_BLOCK
IntlChar::BLOCK_CODE_BASIC_LATIN
IntlChar::BLOCK_CODE_LATIN_1_SUPPLEMENT
IntlChar::BLOCK_CODE_LATIN_EXTENDED_A
IntlChar::BLOCK_CODE_LATIN_EXTENDED_B
IntlChar::BLOCK_CODE_IPA_EXTENSIONS
IntlChar::BLOCK_CODE_SPACING_MODIFIER_LETTERS
IntlChar::BLOCK_CODE_COMBINING_DIACRITICAL_MARKS
IntlChar::BLOCK_CODE_GREEK
IntlChar::BLOCK_CODE_CYRILLIC
IntlChar::BLOCK_CODE_ARMENIAN
IntlChar::BLOCK_CODE_HEBREW
IntlChar::BLOCK_CODE_ARABIC
IntlChar::BLOCK_CODE_SYRIAC
IntlChar::BLOCK_CODE_THAANA
IntlChar::BLOCK_CODE_DEVANAGARI
IntlChar::BLOCK_CODE_BENGALI
IntlChar::BLOCK_CODE_GURMUKHI
IntlChar::BLOCK_CODE_GUJARATI
IntlChar::BLOCK_CODE_ORIYA
IntlChar::BLOCK_CODE_TAMIL
IntlChar::BLOCK_CODE_TELUGU
IntlChar::BLOCK_CODE_KANNADA
IntlChar::BLOCK_CODE_MALAYALAM
IntlChar::BLOCK_CODE_SINHALA
IntlChar::BLOCK_CODE_THAI
IntlChar::BLOCK_CODE_LAO
IntlChar::BLOCK_CODE_TIBETAN
IntlChar::BLOCK_CODE_MYANMAR
IntlChar::BLOCK_CODE_GEORGIAN
IntlChar::BLOCK_CODE_HANGUL_JAMO
IntlChar::BLOCK_CODE_ETHIOPIC
IntlChar::BLOCK_CODE_CHEROKEE
IntlChar::BLOCK_CODE_UNIFIED_CANADIAN_ABORIGINAL_SYLLABICS
IntlChar::BLOCK_CODE_OGHAM
IntlChar::BLOCK_CODE_RUNIC
IntlChar::BLOCK_CODE_KHMER
IntlChar::BLOCK_CODE_MONGOLIAN
IntlChar::BLOCK_CODE_LATIN_EXTENDED_ADDITIONAL
IntlChar::BLOCK_CODE_GREEK_EXTENDED
IntlChar::BLOCK_CODE_GENERAL_PUNCTUATION
IntlChar::BLOCK_CODE_SUPERSCRIPTS_AND_SUBSCRIPTS
IntlChar::BLOCK_CODE_CURRENCY_SYMBOLS
IntlChar::BLOCK_CODE_COMBINING_MARKS_FOR_SYMBOLS
IntlChar::BLOCK_CODE_LETTERLIKE_SYMBOLS
IntlChar::BLOCK_CODE_NUMBER_FORMS
IntlChar::BLOCK_CODE_ARROWS
IntlChar::BLOCK_CODE_MATHEMATICAL_OPERATORS
IntlChar::BLOCK_CODE_MISCELLANEOUS_TECHNICAL
IntlChar::BLOCK_CODE_CONTROL_PICTURES
IntlChar::BLOCK_CODE_OPTICAL_CHARACTER_RECOGNITION
IntlChar::BLOCK_CODE_ENCLOSED_ALPHANUMERICS
IntlChar::BLOCK_CODE_BOX_DRAWING
IntlChar::BLOCK_CODE_BLOCK_ELEMENTS
IntlChar::BLOCK_CODE_GEOMETRIC_SHAPES
IntlChar::BLOCK_CODE_MISCELLANEOUS_SYMBOLS
IntlChar::BLOCK_CODE_DINGBATS
IntlChar::BLOCK_CODE_BRAILLE_PATTERNS
IntlChar::BLOCK_CODE_CJK_RADICALS_SUPPLEMENT
IntlChar::BLOCK_CODE_KANGXI_RADICALS
IntlChar::BLOCK_CODE_IDEOGRAPHIC_DESCRIPTION_CHARACTERS
IntlChar::BLOCK_CODE_CJK_SYMBOLS_AND_PUNCTUATION
IntlChar::BLOCK_CODE_HIRAGANA
IntlChar::BLOCK_CODE_KATAKANA
IntlChar::BLOCK_CODE_BOPOMOFO
IntlChar::BLOCK_CODE_HANGUL_COMPATIBILITY_JAMO
IntlChar::BLOCK_CODE_KANBUN
IntlChar::BLOCK_CODE_BOPOMOFO_EXTENDED
IntlChar::BLOCK_CODE_ENCLOSED_CJK_LETTERS_AND_MONTHS
IntlChar::BLOCK_CODE_CJK_COMPATIBILITY
IntlChar::BLOCK_CODE_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
IntlChar::BLOCK_CODE_CJK_UNIFIED_IDEOGRAPHS
IntlChar::BLOCK_CODE_YI_SYLLABLES
IntlChar::BLOCK_CODE_YI_RADICALS
IntlChar::BLOCK_CODE_HANGUL_SYLLABLES
IntlChar::BLOCK_CODE_HIGH_SURROGATES
IntlChar::BLOCK_CODE_HIGH_PRIVATE_USE_SURROGATES
IntlChar::BLOCK_CODE_LOW_SURROGATES
IntlChar::BLOCK_CODE_PRIVATE_USE_AREA
IntlChar::BLOCK_CODE_PRIVATE_USE
IntlChar::BLOCK_CODE_CJK_COMPATIBILITY_IDEOGRAPHS
IntlChar::BLOCK_CODE_ALPHABETIC_PRESENTATION_FORMS
IntlChar::BLOCK_CODE_ARABIC_PRESENTATION_FORMS_A
IntlChar::BLOCK_CODE_COMBINING_HALF_MARKS
IntlChar::BLOCK_CODE_CJK_COMPATIBILITY_FORMS
IntlChar::BLOCK_CODE_SMALL_FORM_VARIANTS
IntlChar::BLOCK_CODE_ARABIC_PRESENTATION_FORMS_B
IntlChar::BLOCK_CODE_SPECIALS
IntlChar::BLOCK_CODE_HALFWIDTH_AND_FULLWIDTH_FORMS
IntlChar::BLOCK_CODE_OLD_ITALIC
IntlChar::BLOCK_CODE_GOTHIC
IntlChar::BLOCK_CODE_DESERET
IntlChar::BLOCK_CODE_BYZANTINE_MUSICAL_SYMBOLS
IntlChar::BLOCK_CODE_MUSICAL_SYMBOLS
IntlChar::BLOCK_CODE_MATHEMATICAL_ALPHANUMERIC_SYMBOLS
IntlChar::BLOCK_CODE_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
IntlChar::BLOCK_CODE_CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT
IntlChar::BLOCK_CODE_CYRILLIC_SUPPLEMENT
IntlChar::BLOCK_CODE_CYRILLIC_SUPPLEMENTARY
IntlChar::BLOCK_CODE_TAGALOG
IntlChar::BLOCK_CODE_HANUNOO
IntlChar::BLOCK_CODE_BUHID
IntlChar::BLOCK_CODE_TAGBANWA
IntlChar::BLOCK_CODE_MISCELLANEOUS_MATHEMATICAL_SYMBOLS_A
IntlChar::BLOCK_CODE_SUPPLEMENTAL_ARROWS_A
IntlChar::BLOCK_CODE_SUPPLEMENTAL_ARROWS_B
IntlChar::BLOCK_CODE_MISCELLANEOUS_MATHEMATICAL_SYMBOLS_B
IntlChar::BLOCK_CODE_SUPPLEMENTAL_MATHEMATICAL_OPERATORS
IntlChar::BLOCK_CODE_KATAKANA_PHONETIC_EXTENSIONS
IntlChar::BLOCK_CODE_VARIATION_SELECTORS
IntlChar::BLOCK_CODE_SUPPLEMENTARY_PRIVATE_USE_AREA_A
IntlChar::BLOCK_CODE_SUPPLEMENTARY_PRIVATE_USE_AREA_B
IntlChar::BLOCK_CODE_LIMBU
IntlChar::BLOCK_CODE_TAI_LE
IntlChar::BLOCK_CODE_KHMER_SYMBOLS
IntlChar::BLOCK_CODE_PHONETIC_EXTENSIONS
IntlChar::BLOCK_CODE_MISCELLANEOUS_SYMBOLS_AND_ARROWS
IntlChar::BLOCK_CODE_YIJING_HEXAGRAM_SYMBOLS
IntlChar::BLOCK_CODE_LINEAR_B_SYLLABARY
IntlChar::BLOCK_CODE_LINEAR_B_IDEOGRAMS
IntlChar::BLOCK_CODE_AEGEAN_NUMBERS
IntlChar::BLOCK_CODE_UGARITIC
IntlChar::BLOCK_CODE_SHAVIAN
IntlChar::BLOCK_CODE_OSMANYA
IntlChar::BLOCK_CODE_CYPRIOT_SYLLABARY
IntlChar::BLOCK_CODE_TAI_XUAN_JING_SYMBOLS
IntlChar::BLOCK_CODE_VARIATION_SELECTORS_SUPPLEMENT
IntlChar::BLOCK_CODE_ANCIENT_GREEK_MUSICAL_NOTATION
IntlChar::BLOCK_CODE_ANCIENT_GREEK_NUMBERS
IntlChar::BLOCK_CODE_ARABIC_SUPPLEMENT
IntlChar::BLOCK_CODE_BUGINESE
IntlChar::BLOCK_CODE_CJK_STROKES
IntlChar::BLOCK_CODE_COMBINING_DIACRITICAL_MARKS_SUPPLEMENT
IntlChar::BLOCK_CODE_COPTIC
IntlChar::BLOCK_CODE_ETHIOPIC_EXTENDED
IntlChar::BLOCK_CODE_ETHIOPIC_SUPPLEMENT
IntlChar::BLOCK_CODE_GEORGIAN_SUPPLEMENT
IntlChar::BLOCK_CODE_GLAGOLITIC
IntlChar::BLOCK_CODE_KHAROSHTHI
IntlChar::BLOCK_CODE_MODIFIER_TONE_LETTERS
IntlChar::BLOCK_CODE_NEW_TAI_LUE
IntlChar::BLOCK_CODE_OLD_PERSIAN
IntlChar::BLOCK_CODE_PHONETIC_EXTENSIONS_SUPPLEMENT
IntlChar::BLOCK_CODE_SUPPLEMENTAL_PUNCTUATION
IntlChar::BLOCK_CODE_SYLOTI_NAGRI
IntlChar::BLOCK_CODE_TIFINAGH
IntlChar::BLOCK_CODE_VERTICAL_FORMS
IntlChar::BLOCK_CODE_NKO
IntlChar::BLOCK_CODE_BALINESE
IntlChar::BLOCK_CODE_LATIN_EXTENDED_C
IntlChar::BLOCK_CODE_LATIN_EXTENDED_D
IntlChar::BLOCK_CODE_PHAGS_PA
IntlChar::BLOCK_CODE_PHOENICIAN
IntlChar::BLOCK_CODE_CUNEIFORM
IntlChar::BLOCK_CODE_CUNEIFORM_NUMBERS_AND_PUNCTUATION
IntlChar::BLOCK_CODE_COUNTING_ROD_NUMERALS
IntlChar::BLOCK_CODE_SUNDANESE
IntlChar::BLOCK_CODE_LEPCHA
IntlChar::BLOCK_CODE_OL_CHIKI
IntlChar::BLOCK_CODE_CYRILLIC_EXTENDED_A
IntlChar::BLOCK_CODE_VAI
IntlChar::BLOCK_CODE_CYRILLIC_EXTENDED_B
IntlChar::BLOCK_CODE_SAURASHTRA
IntlChar::BLOCK_CODE_KAYAH_LI
IntlChar::BLOCK_CODE_REJANG
IntlChar::BLOCK_CODE_CHAM
IntlChar::BLOCK_CODE_ANCIENT_SYMBOLS
IntlChar::BLOCK_CODE_PHAISTOS_DISC
IntlChar::BLOCK_CODE_LYCIAN
IntlChar::BLOCK_CODE_CARIAN
IntlChar::BLOCK_CODE_LYDIAN
IntlChar::BLOCK_CODE_MAHJONG_TILES
IntlChar::BLOCK_CODE_DOMINO_TILES
IntlChar::BLOCK_CODE_SAMARITAN
IntlChar::BLOCK_CODE_UNIFIED_CANADIAN_ABORIGINAL_SYLLABICS_EXTENDED
IntlChar::BLOCK_CODE_TAI_THAM
IntlChar::BLOCK_CODE_VEDIC_EXTENSIONS
IntlChar::BLOCK_CODE_LISU
IntlChar::BLOCK_CODE_BAMUM
IntlChar::BLOCK_CODE_COMMON_INDIC_NUMBER_FORMS
IntlChar::BLOCK_CODE_DEVANAGARI_EXTENDED
IntlChar::BLOCK_CODE_HANGUL_JAMO_EXTENDED_A
IntlChar::BLOCK_CODE_JAVANESE
IntlChar::BLOCK_CODE_MYANMAR_EXTENDED_A
IntlChar::BLOCK_CODE_TAI_VIET
IntlChar::BLOCK_CODE_MEETEI_MAYEK
IntlChar::BLOCK_CODE_HANGUL_JAMO_EXTENDED_B
IntlChar::BLOCK_CODE_IMPERIAL_ARAMAIC
IntlChar::BLOCK_CODE_OLD_SOUTH_ARABIAN
IntlChar::BLOCK_CODE_AVESTAN
IntlChar::BLOCK_CODE_INSCRIPTIONAL_PARTHIAN
IntlChar::BLOCK_CODE_INSCRIPTIONAL_PAHLAVI
IntlChar::BLOCK_CODE_OLD_TURKIC
IntlChar::BLOCK_CODE_RUMI_NUMERAL_SYMBOLS
IntlChar::BLOCK_CODE_KAITHI
IntlChar::BLOCK_CODE_EGYPTIAN_HIEROGLYPHS
IntlChar::BLOCK_CODE_ENCLOSED_ALPHANUMERIC_SUPPLEMENT
IntlChar::BLOCK_CODE_ENCLOSED_IDEOGRAPHIC_SUPPLEMENT
IntlChar::BLOCK_CODE_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C
IntlChar::BLOCK_CODE_MANDAIC
IntlChar::BLOCK_CODE_BATAK
IntlChar::BLOCK_CODE_ETHIOPIC_EXTENDED_A
IntlChar::BLOCK_CODE_BRAHMI
IntlChar::BLOCK_CODE_BAMUM_SUPPLEMENT
IntlChar::BLOCK_CODE_KANA_SUPPLEMENT
IntlChar::BLOCK_CODE_PLAYING_CARDS
IntlChar::BLOCK_CODE_MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS
IntlChar::BLOCK_CODE_EMOTICONS
IntlChar::BLOCK_CODE_TRANSPORT_AND_MAP_SYMBOLS
IntlChar::BLOCK_CODE_ALCHEMICAL_SYMBOLS
IntlChar::BLOCK_CODE_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D
IntlChar::BLOCK_CODE_ARABIC_EXTENDED_A
IntlChar::BLOCK_CODE_ARABIC_MATHEMATICAL_ALPHABETIC_SYMBOLS
IntlChar::BLOCK_CODE_CHAKMA
IntlChar::BLOCK_CODE_MEETEI_MAYEK_EXTENSIONS
IntlChar::BLOCK_CODE_MEROITIC_CURSIVE
IntlChar::BLOCK_CODE_MEROITIC_HIEROGLYPHS
IntlChar::BLOCK_CODE_MIAO
IntlChar::BLOCK_CODE_SHARADA
IntlChar::BLOCK_CODE_SORA_SOMPENG
IntlChar::BLOCK_CODE_SUNDANESE_SUPPLEMENT
IntlChar::BLOCK_CODE_TAKRI
IntlChar::BLOCK_CODE_BASSA_VAH
IntlChar::BLOCK_CODE_CAUCASIAN_ALBANIAN
IntlChar::BLOCK_CODE_COPTIC_EPACT_NUMBERS
IntlChar::BLOCK_CODE_COMBINING_DIACRITICAL_MARKS_EXTENDED
IntlChar::BLOCK_CODE_DUPLOYAN
IntlChar::BLOCK_CODE_ELBASAN
IntlChar::BLOCK_CODE_GEOMETRIC_SHAPES_EXTENDED
IntlChar::BLOCK_CODE_GRANTHA
IntlChar::BLOCK_CODE_KHOJKI
IntlChar::BLOCK_CODE_KHUDAWADI
IntlChar::BLOCK_CODE_LATIN_EXTENDED_E
IntlChar::BLOCK_CODE_LINEAR_A
IntlChar::BLOCK_CODE_MAHAJANI
IntlChar::BLOCK_CODE_MANICHAEAN
IntlChar::BLOCK_CODE_MENDE_KIKAKUI
IntlChar::BLOCK_CODE_MODI
IntlChar::BLOCK_CODE_MRO
IntlChar::BLOCK_CODE_MYANMAR_EXTENDED_B
IntlChar::BLOCK_CODE_NABATAEAN
IntlChar::BLOCK_CODE_OLD_NORTH_ARABIAN
IntlChar::BLOCK_CODE_OLD_PERMIC
IntlChar::BLOCK_CODE_ORNAMENTAL_DINGBATS
IntlChar::BLOCK_CODE_PAHAWH_HMONG
IntlChar::BLOCK_CODE_PALMYRENE
IntlChar::BLOCK_CODE_PAU_CIN_HAU
IntlChar::BLOCK_CODE_PSALTER_PAHLAVI
IntlChar::BLOCK_CODE_SHORTHAND_FORMAT_CONTROLS
IntlChar::BLOCK_CODE_SIDDHAM
IntlChar::BLOCK_CODE_SINHALA_ARCHAIC_NUMBERS
IntlChar::BLOCK_CODE_SUPPLEMENTAL_ARROWS_C
IntlChar::BLOCK_CODE_TIRHUTA
IntlChar::BLOCK_CODE_WARANG_CITI
IntlChar::BLOCK_CODE_COUNT
IntlChar::BLOCK_CODE_INVALID_CODE
IntlChar::BPT_NONE
IntlChar::BPT_OPEN
IntlChar::BPT_CLOSE
IntlChar::BPT_COUNT
IntlChar::EA_NEUTRAL
IntlChar::EA_AMBIGUOUS
IntlChar::EA_HALFWIDTH
IntlChar::EA_FULLWIDTH
IntlChar::EA_NARROW
IntlChar::EA_WIDE
IntlChar::EA_COUNT
IntlChar::UNICODE_CHAR_NAME
IntlChar::UNICODE_10_CHAR_NAME
IntlChar::EXTENDED_CHAR_NAME
IntlChar::CHAR_NAME_ALIAS
IntlChar::CHAR_NAME_CHOICE_COUNT
IntlChar::SHORT_PROPERTY_NAME
IntlChar::LONG_PROPERTY_NAME
IntlChar::PROPERTY_NAME_CHOICE_COUNT
IntlChar::DT_NONE
IntlChar::DT_CANONICAL
IntlChar::DT_COMPAT
IntlChar::DT_CIRCLE
IntlChar::DT_FINAL
IntlChar::DT_FONT
IntlChar::DT_FRACTION
IntlChar::DT_INITIAL
IntlChar::DT_ISOLATED
IntlChar::DT_MEDIAL
IntlChar::DT_NARROW
IntlChar::DT_NOBREAK
IntlChar::DT_SMALL
IntlChar::DT_SQUARE
IntlChar::DT_SUB
IntlChar::DT_SUPER
IntlChar::DT_VERTICAL
IntlChar::DT_WIDE
IntlChar::DT_COUNT
IntlChar::JT_NON_JOINING
IntlChar::JT_JOIN_CAUSING
IntlChar::JT_DUAL_JOINING
IntlChar::JT_LEFT_JOINING
IntlChar::JT_RIGHT_JOINING
IntlChar::JT_TRANSPARENT
IntlChar::JT_COUNT
IntlChar::JG_NO_JOINING_GROUP
IntlChar::JG_AIN
IntlChar::JG_ALAPH
IntlChar::JG_ALEF
IntlChar::JG_BEH
IntlChar::JG_BETH
IntlChar::JG_DAL
IntlChar::JG_DALATH_RISH
IntlChar::JG_E
IntlChar::JG_FEH
IntlChar::JG_FINAL_SEMKATH
IntlChar::JG_GAF
IntlChar::JG_GAMAL
IntlChar::JG_HAH
IntlChar::JG_TEH_MARBUTA_GOAL
IntlChar::JG_HAMZA_ON_HEH_GOAL
IntlChar::JG_HE
IntlChar::JG_HEH
IntlChar::JG_HEH_GOAL
IntlChar::JG_HETH
IntlChar::JG_KAF
IntlChar::JG_KAPH
IntlChar::JG_KNOTTED_HEH
IntlChar::JG_LAM
IntlChar::JG_LAMADH
IntlChar::JG_MEEM
IntlChar::JG_MIM
IntlChar::JG_NOON
IntlChar::JG_NUN
IntlChar::JG_PE
IntlChar::JG_QAF
IntlChar::JG_QAPH
IntlChar::JG_REH
IntlChar::JG_REVERSED_PE
IntlChar::JG_SAD
IntlChar::JG_SADHE
IntlChar::JG_SEEN
IntlChar::JG_SEMKATH
IntlChar::JG_SHIN
IntlChar::JG_SWASH_KAF
IntlChar::JG_SYRIAC_WAW
IntlChar::JG_TAH
IntlChar::JG_TAW
IntlChar::JG_TEH_MARBUTA
IntlChar::JG_TETH
IntlChar::JG_WAW
IntlChar::JG_YEH
IntlChar::JG_YEH_BARREE
IntlChar::JG_YEH_WITH_TAIL
IntlChar::JG_YUDH
IntlChar::JG_YUDH_HE
IntlChar::JG_ZAIN
IntlChar::JG_FE
IntlChar::JG_KHAPH
IntlChar::JG_ZHAIN
IntlChar::JG_BURUSHASKI_YEH_BARREE
IntlChar::JG_FARSI_YEH
IntlChar::JG_NYA
IntlChar::JG_ROHINGYA_YEH
IntlChar::JG_MANICHAEAN_ALEPH
IntlChar::JG_MANICHAEAN_AYIN
IntlChar::JG_MANICHAEAN_BETH
IntlChar::JG_MANICHAEAN_DALETH
IntlChar::JG_MANICHAEAN_DHAMEDH
IntlChar::JG_MANICHAEAN_FIVE
IntlChar::JG_MANICHAEAN_GIMEL
IntlChar::JG_MANICHAEAN_HETH
IntlChar::JG_MANICHAEAN_HUNDRED
IntlChar::JG_MANICHAEAN_KAPH
IntlChar::JG_MANICHAEAN_LAMEDH
IntlChar::JG_MANICHAEAN_MEM
IntlChar::JG_MANICHAEAN_NUN
IntlChar::JG_MANICHAEAN_ONE
IntlChar::JG_MANICHAEAN_PE
IntlChar::JG_MANICHAEAN_QOPH
IntlChar::JG_MANICHAEAN_RESH
IntlChar::JG_MANICHAEAN_SADHE
IntlChar::JG_MANICHAEAN_SAMEKH
IntlChar::JG_MANICHAEAN_TAW
IntlChar::JG_MANICHAEAN_TEN
IntlChar::JG_MANICHAEAN_TETH
IntlChar::JG_MANICHAEAN_THAMEDH
IntlChar::JG_MANICHAEAN_TWENTY
IntlChar::JG_MANICHAEAN_WAW
IntlChar::JG_MANICHAEAN_YODH
IntlChar::JG_MANICHAEAN_ZAYIN
IntlChar::JG_STRAIGHT_WAW
IntlChar::JG_COUNT
IntlChar::GCB_OTHER
IntlChar::GCB_CONTROL
IntlChar::GCB_CR
IntlChar::GCB_EXTEND
IntlChar::GCB_L
IntlChar::GCB_LF
IntlChar::GCB_LV
IntlChar::GCB_LVT
IntlChar::GCB_T
IntlChar::GCB_V
IntlChar::GCB_SPACING_MARK
IntlChar::GCB_PREPEND
IntlChar::GCB_REGIONAL_INDICATOR
IntlChar::GCB_COUNT
IntlChar::WB_OTHER
IntlChar::WB_ALETTER
IntlChar::WB_FORMAT
IntlChar::WB_KATAKANA
IntlChar::WB_MIDLETTER
IntlChar::WB_MIDNUM
IntlChar::WB_NUMERIC
IntlChar::WB_EXTENDNUMLET
IntlChar::WB_CR
IntlChar::WB_EXTEND
IntlChar::WB_LF
IntlChar::WB_MIDNUMLET
IntlChar::WB_NEWLINE
IntlChar::WB_REGIONAL_INDICATOR
IntlChar::WB_HEBREW_LETTER
IntlChar::WB_SINGLE_QUOTE
IntlChar::WB_DOUBLE_QUOTE
IntlChar::WB_COUNT
IntlChar::SB_OTHER
IntlChar::SB_ATERM
IntlChar::SB_CLOSE
IntlChar::SB_FORMAT
IntlChar::SB_LOWER
IntlChar::SB_NUMERIC
IntlChar::SB_OLETTER
IntlChar::SB_SEP
IntlChar::SB_SP
IntlChar::SB_STERM
IntlChar::SB_UPPER
IntlChar::SB_CR
IntlChar::SB_EXTEND
IntlChar::SB_LF
IntlChar::SB_SCONTINUE
IntlChar::SB_COUNT
IntlChar::LB_UNKNOWN
IntlChar::LB_AMBIGUOUS
IntlChar::LB_ALPHABETIC
IntlChar::LB_BREAK_BOTH
IntlChar::LB_BREAK_AFTER
IntlChar::LB_BREAK_BEFORE
IntlChar::LB_MANDATORY_BREAK
IntlChar::LB_CONTINGENT_BREAK
IntlChar::LB_CLOSE_PUNCTUATION
IntlChar::LB_COMBINING_MARK
IntlChar::LB_CARRIAGE_RETURN
IntlChar::LB_EXCLAMATION
IntlChar::LB_GLUE
IntlChar::LB_HYPHEN
IntlChar::LB_IDEOGRAPHIC
IntlChar::LB_INSEPARABLE
IntlChar::LB_INSEPERABLE
IntlChar::LB_INFIX_NUMERIC
IntlChar::LB_LINE_FEED
IntlChar::LB_NONSTARTER
IntlChar::LB_NUMERIC
IntlChar::LB_OPEN_PUNCTUATION
IntlChar::LB_POSTFIX_NUMERIC
IntlChar::LB_PREFIX_NUMERIC
IntlChar::LB_QUOTATION
IntlChar::LB_COMPLEX_CONTEXT
IntlChar::LB_SURROGATE
IntlChar::LB_SPACE
IntlChar::LB_BREAK_SYMBOLS
IntlChar::LB_ZWSPACE
IntlChar::LB_NEXT_LINE
IntlChar::LB_WORD_JOINER
IntlChar::LB_H2
IntlChar::LB_H3
IntlChar::LB_JL
IntlChar::LB_JT
IntlChar::LB_JV
IntlChar::LB_CLOSE_PARENTHESIS
IntlChar::LB_CONDITIONAL_JAPANESE_STARTER
IntlChar::LB_HEBREW_LETTER
IntlChar::LB_REGIONAL_INDICATOR
IntlChar::LB_COUNT
IntlChar::NT_NONE
IntlChar::NT_DECIMAL
IntlChar::NT_DIGIT
IntlChar::NT_NUMERIC
IntlChar::NT_COUNT
IntlChar::HST_NOT_APPLICABLE
IntlChar::HST_LEADING_JAMO
IntlChar::HST_VOWEL_JAMO
IntlChar::HST_TRAILING_JAMO
IntlChar::HST_LV_SYLLABLE
IntlChar::HST_LVT_SYLLABLE
IntlChar::HST_COUNT
IntlChar::FOLD_CASE_DEFAULT
IntlChar::FOLD_CASE_EXCLUDE_SPECIAL_I
The authoritative source on what these character classes mean is Unicode Standard "Unicode Character Database", documented at https://www.unicode.org/reports/tr44/ (see chapter 5).
For a description of the constants, have a look into uchar.h documentation of the ICU4C API: http://icu-project.org/apiref/icu4c/uchar_8h.html