Make a string's first character uppercase

# mb_ucfirst

(PHP 8 >= 8.4.0)

mb_ucfirst — Make a string's first character uppercase

### 说明

function mb_ucfirst(string `$string`, ?string `$encoding` = `null`): string

Performs a multi-byte safe ucfirst() operation, and returns a string with the first character of `string` title-cased.

### 参数

`string`
  The input string.
`encoding`
  The string encoding.

### 返回值

Returns the resulting string.

### 注释

> 注意:

> By contrast to the standard case folding functions such as strtolower() and strtoupper(), case folding is performed on the basis of the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such a-umlaut (ä).

For more information about the Unicode properties, please see » http://www.unicode.org/reports/tr21/.

### 参见

- mb_lcfirst() - Make a string's first character lowercase
- mb_convert_case() - 对字符串进行大小写转换
- ucfirst() - 将字符串的首字母转换为大写

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