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(PHP 7, PHP 8)
IntlChar::iscntrl — Check if code point is a control character
$codepoint): ?bool
Determines whether the specified code point is a control character.
A control character is one of the following:
IntlChar::CHAR_CATEGORY_CONTROL_CHAR (Cc)IntlChar::CHAR_CATEGORY_FORMAT_CHAR (Cf)IntlChar::CHAR_CATEGORY_LINE_SEPARATOR (Zl)IntlChar::CHAR_CATEGORY_PARAGRAPH_SEPARATOR (Zp)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}")
Returns true if
codepoint is a control character, false if not. Returns null on failure.
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)
IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT