(PHP 7, PHP 8)
IntlChar::charDigitValue — Get the decimal digit value of a decimal digit character
$codepoint): ?intReturns the decimal digit value of a decimal digit character.
Such characters have the general category "Nd" (decimal digit numbers) and a Numeric_Type of Decimal.
codepointThe int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
The decimal digit value of codepoint,
or -1 if it is not a decimal digit character. Returns null on failure.
示例 #1 Testing different code points
<?php
var_dump(IntlChar::charDigitValue("1"));
var_dump(IntlChar::charDigitValue("\u{0662}"));
var_dump(IntlChar::charDigitValue("\u{0E53}"));
?>以上示例会输出：
int(1) int(2) int(3)