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.
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
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