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  • IntlChar::iscntrl()

    版本:php7

    (PHP 7)

    Check if code point is a control character

    说明

    publicstaticIntlChar::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