IntlChar::iscntrl

(PHP 7, PHP 8)

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

说明

public static IntlChar::iscntrl ( mixed $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.

范例

Example #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

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