PHP - Manual: IntlChar::charDirection
2024-12-22
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): ?intReturns 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.
0x2603for 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_RIGHTIntlChar::CHAR_DIRECTION_RIGHT_TO_LEFTIntlChar::CHAR_DIRECTION_EUROPEAN_NUMBERIntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_SEPARATORIntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_TERMINATORIntlChar::CHAR_DIRECTION_ARABIC_NUMBERIntlChar::CHAR_DIRECTION_COMMON_NUMBER_SEPARATORIntlChar::CHAR_DIRECTION_BLOCK_SEPARATORIntlChar::CHAR_DIRECTION_SEGMENT_SEPARATORIntlChar::CHAR_DIRECTION_WHITE_SPACE_NEUTRALIntlChar::CHAR_DIRECTION_OTHER_NEUTRALIntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_EMBEDDINGIntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_OVERRIDEIntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_ARABICIntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_EMBEDDINGIntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_OVERRIDEIntlChar::CHAR_DIRECTION_POP_DIRECTIONAL_FORMATIntlChar::CHAR_DIRECTION_DIR_NON_SPACING_MARKIntlChar::CHAR_DIRECTION_BOUNDARY_NEUTRALIntlChar::CHAR_DIRECTION_FIRST_STRONG_ISOLATEIntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_ISOLATEIntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_ISOLATEIntlChar::CHAR_DIRECTION_POP_DIRECTIONAL_ISOLATEIntlChar::CHAR_DIRECTION_CHAR_DIRECTION_COUNT
null on failure.
范例
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);
?>
以上例程会输出：
bool(true) bool(true) bool(true) bool(true)
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官方地址：https://www.php.net/manual/en/intlchar.chardirection.php
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