# IntlChar::isbase

(PHP 7, PHP 8)

IntlChar::isbase — Check if code point is a base character

### 说明

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

Determines whether the specified code point is a base character. `true` for general categories "L" (letters), "N" (numbers), "Mc" (spacing combining marks), and "Me" (enclosing marks).

> 注意:

> This is different from the Unicode definition in chapter 3.5, conformance clause D13, which defines base characters to be all characters (not Cn) that do not graphically combine with preceding characters (M) and that are neither control (Cc) or format (Cf) characters.

### 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 base character, `false` if not. Returns `null` on failure.

### 示例

示例 #1 Testing different code points

`<?php
var_dump(IntlChar::isbase("A"));
var_dump(IntlChar::isbase("1"));
var_dump(IntlChar::isbase("\u{2603}"));
?>`

以上示例会输出：

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

### 参见

- IntlChar::isalpha() - Check if code point is a letter character
- IntlChar::isdigit() - Check if code point is a digit character

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