Check if code point is an ignorable character

# IntlChar::isIDIgnorable

(PHP 7)

IntlChar::isIDIgnorable — Check if code point is an ignorable character

### 説明

public static IntlChar::isIDIgnorable ( mixed `$codepoint` ) : bool

Determines if the specified character should be regarded as an ignorable character in an identifier.

`TRUE` for characters with general category "Cf" (format controls) as well as non-whitespace ISO controls (U+0000..U+0008, U+000E..U+001B, U+007F..U+009F).

> 注意:

> Note that Unicode just recommends to ignore Cf (format controls).

### 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

Returns `TRUE` if `codepoint` is ignorable in identifiers, `FALSE` if not.

### 例

例1 さまざまなコードポイントの例

`<?php
var_dump(IntlChar::isIDIgnorable("A"));
var_dump(IntlChar::isIDIgnorable(" "));
var_dump(IntlChar::isIDIgnorable("\u{007F}"));
?>`

上の例の出力は以下となります。

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

### 参考

- IntlChar::isIDStart() - Check if code point is permissible as the first character in an identifier
- IntlChar::isIDPart() - Check if code point is permissible in an identifier
- `IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT`