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    IntlChar::isupper

    (PHP 7, PHP 8)

    IntlChar::isupper — Check if code point has the general category "Lu" (uppercase letter)

    说明

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

    Determines whether the specified code point has the general category "Lu" (uppercase letter).

    注意:

    This misses some characters that are also uppercase but have a different general category value. In order to include those, use IntlChar::isUUppercase().

    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 an Lu uppercase letter, false if not. Returns null on failure.

    示例

    示例 #1 Testing different code points

    <?php
    var_dump    (IntlChar::isupper("A"));
    var_dump(IntlChar::isupper("a"));
    var_dump(IntlChar::isupper("Φ"));
    var_dump(IntlChar::isupper("φ"));
    var_dump(IntlChar::isupper("1"));
    ?>

    以上示例会输出：

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

    参见

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