(PHP 7, PHP 8)
IntlChar::charDirection — Get bidirectional category value for a code point
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.
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_COUNTnull on failure.
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)