Get the numeric value for a Unicode code point

# IntlChar::getNumericValue

(PHP 7, PHP 8)

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

### 说明

public static function 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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