为什么有些 PHP 程序员在他们的命名空间中使用双反斜杠而不是一个? [英] Why do some PHP programmers use a double backslash in their namespaces instead of a single one?

问题描述

今天在扫描一些库代码时，我已经看到好几次了:不是声明一个 Namespace\Like\This，而是 Done\\Like\\This.

While scanning some library code today, I've seen it several times: Instead of declaring a Namespace\Like\This, it's Done\\Like\\This.

有人能指教我 - 这背后的原因是什么?

Could somebody please enlighten me – whats the reason behind this?

我只能想象它要么是特定于框架的东西(我不相信)，要么是我不理解的一种奇怪的转义形式.

All I can images that it's either something framework specific (which I don't believe), or it's a strange form of escaping that I don't understand.

推荐答案

当你在字符串中引用类名时，你应该使用双反斜杠，例如:$className = "Foo\\Bar". 这是防止字符转义，一个熟悉的例子是换行符 echo "Hello World\n"; 如果你有两个反斜杠，它会打印 "Hello World\n" 而不是 "Hello World"换行.

You should use double backslash when you're referencing the class name in a string, eg: $className = "Foo\\Bar". This is prevent the escaping of characters, a familiar example would be a newline echo "Hello World\n"; If you had two backslashes it would print "Hello World\n" rather than "Hello World" with a new line.

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