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    IntlChar::istitle

    (PHP 7, PHP 8)

    IntlChar::istitle — Check if code point is a titlecase letter

    说明

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

    Determines whether the specified code point is a titlecase letter.

    true for general category "Lt" (titlecase letter).

    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 titlecase letter, false if not. Returns null on failure.

    示例

    示例 #1 Testing different code points

    <?php
    // Latin Capital Letter Dz with Caron U+01C4
    var_dump(IntlChar::istitle("DŽ"));
    // Latin Capital Letter D with Small Letter Z with Caron U+01C5
    var_dump(IntlChar::istitle("Dž"));
    // Latin Small Letter Dz with Caron U+01C6
    var_dump(IntlChar::istitle("dž"));

    // Greek Capital Letter Alpha with Prosgegrammeni U+1FBC
    var_dump(IntlChar::istitle("ᾼ"));
    // Greek Small Letter Alpha with Ypogegrammeni U+1FB3
    var_dump(IntlChar::istitle("ᾳ"));
    // Greek Capital Letter Alpha U+0391
    var_dump(IntlChar::istitle("Α"));
    ?>

    以上示例会输出：

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

    参见

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