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    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:

    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.

    示例

    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}"));
    ?>

    以上示例会输出：

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

    参见

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