Check if code point has the Alphabetic Unicode property

# IntlChar::isUAlphabetic

(PHP 7, PHP 8)

IntlChar::isUAlphabetic — Check if code point has the Alphabetic Unicode property

### 说明

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

Check if a code point has the Alphabetic Unicode property.

This is the same as `IntlChar::hasBinaryProperty($codepoint, IntlChar::PROPERTY_ALPHABETIC)`

### 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` has the Alphabetic Unicode property, `false` if not. Returns `null` on failure.

### 示例

示例 #1 Testing different code points

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

以上示例会输出：

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

### 参见

- IntlChar::isalpha() - Check if code point is a letter character
- IntlChar::hasBinaryProperty() - Check a binary Unicode property for a code point
- `IntlChar::PROPERTY_ALPHABETIC`

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