IntlChar::getNumericValue

    (PHP 7, PHP 8)

    IntlChar::getNumericValue — Get the numeric value for a Unicode code point

    说明

    public static IntlChar::getNumericValue(int|string $codepoint): ?float

    Gets the numeric value for a Unicode code point as defined in the Unicode Character Database.

    For characters without any numeric values in the Unicode Character Database, this function will return IntlChar::NO_NUMERIC_VALUE.

    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

    Numeric value of codepoint, or IntlChar::NO_NUMERIC_VALUE if none is defined. This constant was added in PHP 7.0.6, prior to this version the literal value (float)-123456789 may be used instead. Returns null on failure.

    示例

    示例 #1 Testing different code points

    <?php
    var_dump    (IntlChar::getNumericValue("4"));
    var_dump(IntlChar::getNumericValue("x"));
    var_dump(IntlChar::getNumericValue("\u{216C}"));
    ?>

    以上示例会输出：

    float(4)
float(-123456789)
float(50)

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