# 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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