IntlChar::iscntrl

(PHP 7, PHP 8)

IntlChar::iscntrl — Check if code point is a control character

说明

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

Determines whether the specified code point is a control character.

A control character is one of the following:

  • ISO 8-bit control character (U+0000..U+001f and U+007f..U+009f)
  • IntlChar::CHAR_CATEGORY_CONTROL_CHAR (Cc)
  • IntlChar::CHAR_CATEGORY_FORMAT_CHAR (Cf)
  • IntlChar::CHAR_CATEGORY_LINE_SEPARATOR (Zl)
  • IntlChar::CHAR_CATEGORY_PARAGRAPH_SEPARATOR (Zp)

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 a control character, false if not. Returns null on failure.

范例

示例 #1 Testing different code points

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

以上例程会输出：

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

参见

  • IntlChar::isprint() - Check if code point is a printable character
  • IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT