# IntlChar::isISOControl

(PHP 7, PHP 8)

IntlChar::isISOControl — Check if code point is an ISO control code

### 说明

public static IntlChar::isISOControl(int|string `$codepoint`): ?bool

Determines whether the specified code point is an ISO control code.

`true` for U+0000..U+001f and U+007f..U+009f (general category "Cc").

### 参数

`codepoint`

  The int codepoint value (e.g. `0x2603` for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. `"\u{2603}"`)

### 返回值

Returns `true` if `codepoint` is an ISO control code, `false` if not. Returns `null` on failure.

### 示例

示例 #1 Testing different code points

`<?php
var_dump(IntlChar::isISOControl(" "));
var_dump(IntlChar::isISOControl("\n"));
var_dump(IntlChar::isISOControl("\u{200e}"));
?>`

以上示例会输出：

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

### 参见

- IntlChar::iscntrl() - Check if code point is a control character

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