imap_binary (PHP 4, PHP 5, PHP 7, PHP 8)imap_binary — Convert an 8bit string to a base64 string 说明 imap_binary(string $string): string|false Convert an 8bit string to a base64 string according to » RFC2045, Section 6.8. 参数 string The 8bit string 返回值 Returns a base64 encoded string, 或者在失败时返回 false. 参见 imap_base64() - Decode BASE64 encoded text