PHP mb_substr() 无法正常工作?

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时间:2020-08-25 06:20:17  来源:igfitidea点击:

PHP mb_substr() not working correctly?

phpstringutf-8multibytembstring

提问by Alex

This code

这段代码

print mb_substr('éxxx', 0, 1);

print mb_substr('éxxx', 0, 1);

prints an empty space :(

打印一个空白空间:(

It is supposed to print the first character, é. This seems to work however:

它应该打印第一个字符,é. 然而,这似乎有效:

print mb_substr('éxxx', 0, 2);

print mb_substr('éxxx', 0, 2);

But it's not right, because (0, 2) means 2 characters...

但这是不对的,因为 (0, 2) 表示 2 个字符......

回答by povilasp

Try passing the encoding parameter to mb_substr, as such:

尝试将编码参数传递给 mb_substr,如下所示:

print mb_substr('éxxx', 0, 1, 'utf-8');

The encoding is never detected automatically.

编码永远不会自动检测。

回答by álvaro González

In practice I've found that, in some systems, multi-byte functions default to ISO-8859-1 for internal encoding. That effectively ruins their ability to handle multi-byte text.

在实践中,我发现在某些系统中,多字节函数默认使用 ISO-8859-1 进行内部编码。这实际上破坏了他们处理多字节文本的能力。

Setting a good default will probably fix this and some other issues:

设置一个好的默认值可能会解决这个问题和其他一些问题:

mb_internal_encoding('UTF-8');