IntlChar::isdigit

(PHP 7, PHP 8)

IntlChar::isdigit — Check if code point is a digit character

说明

public static IntlChar::isdigit(int|string $codepoint): ?bool

Determines whether the specified code point is a digit character.

true for characters with general category "Nd" (decimal digit numbers). Beginning with Unicode 4, this is the same as testing for the Numeric_Type of Decimal.

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

Returns true if codepoint is a digit character, false if not. Returns null on failure.

示例

示例 #1 Testing different code points

<?php
var_dump(IntlChar::isdigit("A"));
var_dump(IntlChar::isdigit("1"));
var_dump(IntlChar::isdigit("\t"));
?>

以上示例会输出：

bool(false)
bool(true)
bool(false)

参见

IntlChar::isalpha() - Check if code point is a letter character
IntlChar::isalnum() - Check if code point is an alphanumeric character
IntlChar::isxdigit() - Check if code point is a hexadecimal digit
ctype_digit() - 检测数字字符

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