字符串文字前面的b有什么作用? [英] What does the b in front of string literals do?

问题描述

$binary = b'Binary string';

以b inary形式创建字符串有什么后果?

What consequences does it have to create a string as binary?

我在文档中找不到关于此的任何提示.刚刚在查看language_scanner时发现了这种好奇心.

I couldn't find any hint about that in the documentation. Just found this little curiosity while looking through the language_scanner.

推荐答案

这是永不发布的PHP版本6的前向兼容性令牌，该版本应该具有本机unicode支持.

This is a forward compatibility token for the never-to-be-released PHP version 6, which should have had native unicode support.

在PHP6中，字符串默认为unicode，并且函数在其上的unicode字符级别上运行. "b"表示二进制字符串"，即非Unicode字符串，其功能在字节级别上运行.

In PHP6, strings are unicode by default, and functions operate at the unicode character level on them. This "b" means "binary string", that is, a non unicode string, on which functions operate at the byte level.

这在PHP！= 6(所有字符串均为二进制)中无效.

This has no effect in PHP != 6, where all strings are binary.

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