Get bidirectional category value for a code point

# IntlChar::charDirection

(PHP 7)

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

### 説明

public static IntlChar::charDirection ( mixed `$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.

### パラメータ

`codepoint`

  コードポイントを表す integer 型の値 (例: U+2603 SNOWMAN を表す 0x2603)、あるいは UTF-8 文字列としてエンコードされた文字 (例: "\u{2603}")。

### 返り値

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`

### 例

例1 さまざまなコードポイントの例

`<?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);
?>`

上の例の出力は以下となります。

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