Encode a UTF-8 string to modified UTF-7

# imap_utf8_to_mutf7

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

imap_utf8_to_mutf7 — Encode a UTF-8 string to modified UTF-7

### 说明

function imap_utf8_to_mutf7(string `$string`): string|false

Encode a UTF-8 string to modified UTF-7 (as specified in RFC 2060, section 5.1.3).

> 注意:

> This function is only available, if libcclient exports utf8_to_mutf7().

### 参数

`string`

  A UTF-8 encoded string.

### 返回值

Returns `string` converted to modified UTF-7, 或者在失败时返回 `false`.

### 参见

- imap_mutf7_to_utf8() - Decode a modified UTF-7 string to UTF-8

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