IntlChar::iscntrl()
版本:php7
(PHP 7)
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
- $codepoint
The integer codepoint value(e.g.0x2603forU+2603 SNOWMAN), or the character encoded as a UTF-8 string(e.g."u{2603}")
返回值
Returns TRUE
if$codepointis a control character,FALSE
if not.
范例
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