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    IntlChar::charDirection

    (PHP 7, PHP 8)

    IntlChar::charDirection — Get bidirectional category value for a code point

    说明

    public static IntlChar::charDirection(int|string $codepoint): ?int

    Returns the bidirectional category value for the code point, which is used in the » Unicode bidirectional algorithm (UAX #9).

    注意:

    Some unassigned code points have bidi values of R or AL because they are in blocks that are reserved for Right-To-Left scripts.

    参数

    codepoint

    The int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")

    返回值

    The bidirectional category value; one of the following constants:

    • 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
    Returns null on failure.

    示例

    示例 #1 Testing different code points

    <?php
    var_dump    (IntlChar::charDirection("A") === IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT);
    var_dump(IntlChar::charDirection("\u{05E9}") === IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT);
    var_dump(IntlChar::charDirection("+") === IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_SEPARATOR);
    var_dump(IntlChar::charDirection(".") === IntlChar::CHAR_DIRECTION_COMMON_NUMBER_SEPARATOR);
    ?>

    以上示例会输出：

     
bool(true)
bool(true)
bool(true)
bool(true)
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