即使我们只调用一次函数，使用关键字 我也可以使用 在我看来，第二个版本更清晰，但如果我使用<是否有任何性能问题 代码>使用仅用于一次调用？
use 也不好吗？
E.g。 我有自己的typo3扩展，我在我的控制器中访问一个typo3核心函数，但只有一次。
$ message = \ TYPO3 \ CMS \ Core \ Utility \ GeneralUtility :: makeInstance（'TYPO3 \\ CMS \\ Core \\ Mail \\ MailMessage'）;
use ：
使用\ TYPO3 \ CMS \ Core \ Utility \ GeneralUtility;
...
$ message = GeneralUtility :: makeInstance（'TYPO3 \\ CMS \ \ Core \\ Mail \\ MailMessage'）;
Is it bad to use the keyword use even though we only call a function once?
E.g. I have my own typo3 extension, and I am accessing a typo3 core function in my controller, but only once.
$message = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Mail\\MailMessage');
I could also make use of use:
use \TYPO3\CMS\Core\Utility\GeneralUtility;
...
$message = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Mail\\MailMessage');
In my opinion the second variant is much cleaner, but are there any performance issues if I make use of use only for one call?
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