Perform case folding on a code point

# IntlChar::foldCase

(PHP 7)

IntlChar::foldCase — Perform case folding on a code point

### 説明

public static IntlChar::foldCase ( mixed `$codepoint` [, int `$options` = `IntlChar::FOLD_CASE_DEFAULT` ] ) : mixed

The given character is mapped to its case folding equivalent; if the character has no case folding equivalent, the character itself is returned.

### 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}")。

`options`

  Either `IntlChar::FOLD_CASE_DEFAULT` (default) or `IntlChar::FOLD_CASE_EXCLUDE_SPECIAL_I`.

### 返り値

Returns the Simple_Case_Folding of the code point, if any; otherwise the code point itself.