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    IntlChar::isxdigit

    (PHP 7, PHP 8)

    IntlChar::isxdigit — Check if code point is a hexadecimal digit

    说明

    public static IntlChar::isxdigit(int|string $codepoint): ?bool

    Determines whether the specified code point is a hexadecimal digit.

    true for characters with general category "Nd" (decimal digit numbers) as well as Latin letters a-f and A-F in both ASCII and Fullwidth ASCII. (That is, for letters with code points 0041..0046, 0061..0066, FF21..FF26, FF41..FF46.)

    This is equivalent to IntlChar::digit($codepoint, 16) >= 0.

    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 hexadecimal character, false if not. Returns null on failure.

    示例

    示例 #1 Testing different code points

    <?php
    var_dump    (IntlChar::isxdigit("A"));
    var_dump(IntlChar::isxdigit("1"));
    var_dump(IntlChar::isxdigit("\u{2603}"));
    ?>

    以上示例会输出：

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

    注释

    注意:

    In order to narrow the definition of hexadecimal digits to only ASCII characters use:

    <?php
    $isASCIIHexadecimal     = IntlChar::ord($codepoint) <= 0x7F && IntlChar::isxdigit($codepoint);
    ?>

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