IntlChar::digit

(PHP 7)

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

説明

public static int IntlChar::digit ( string $codepoint [, int $radix = 10 ] )

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.

パラメータ

codepoint: コードポイントを表す integer 型の値 (例: U+2603 SNOWMAN を表す 0x2603)、あるいは UTF-8 文字列としてエンコードされた文字 (例: "\u{2603}")。
radix: The radix (defaults to 10).

返り値

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.

警告

この関数は論理値 FALSE を返す可能性がありますが、FALSE として評価される値を返す可能性もあります。詳細については論理値のセクションを参照してください。この関数の返り値を調べるには ===演算子を使用してください。

例

例1 さまざまなコードポイントの例


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

上の例の出力は以下となります。

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

参考

IntlChar::forDigit() - Get character representation for a given digit and radix
IntlChar::charDigitValue() - Get the decimal digit value of a decimal digit character
IntlChar::isdigit() - Check if code point is a digit character
IntlChar::PROPERTY_NUMERIC_TYPE