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IntlChar::digit

(PHP 7, PHP 8)

IntlChar::digit — Get the decimal digit value of a code point for a given radix

說(shuō)明

public static IntlChar::digit(int|string $codepoint, int $base = 10): int|false|null

Returns the decimal digit value of the code point in the specified radix.

If the radix is not in the range 2<=radix<=36 or if the value of codepoint is not a valid digit in the specified radix, false is returned. A character is a valid digit if at least one of the following is true:

  • The character has a decimal digit value. Such characters have the general category "Nd" (decimal digit numbers) and a Numeric_Type of Decimal. In this case the value is the character's decimal digit value.
  • The character is one of the uppercase Latin letters 'A' through 'Z'. In this case the value is c-'A'+10.
  • The character is one of the lowercase Latin letters 'a' through 'z'. In this case the value is ch-'a'+10.
  • Latin letters from both the ASCII range (0061..007A, 0041..005A) as well as from the Fullwidth ASCII range (FF41..FF5A, FF21..FF3A) are recognized.

參數

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}")

base

The radix (defaults to 10).

返回值

Returns the numeric value represented by the character in the specified radix, or false if there is no value or if the value exceeds the radix. Returns null on failure.

警告

此函數可能返回布爾值 false，但也可能返回等同于 false 的非布爾值。請閱讀 布爾類(lèi)型章節以獲取更多信息。應使用 === 運算符來(lái)測試此函數的返回值。

范例

示例 #1 Testing different code points

<?php
var_dump(IntlChar::digit("0"));
var_dump(IntlChar::digit("3"));
var_dump(IntlChar::digit("A"));
var_dump(IntlChar::digit("A", 16));
?>

以上例程會(huì )輸出：

int(0)
int(3)
bool(false)
int(10)

參見(jiàn)

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