PHP does not support unicode character sets. Why can unicode be correctly output?

If it is a Chinese character, it should not be output correctly .. And for example php file encoding for UTF-8, then the internal String type is UTF-8? My answer is No. Since the String does not support UTF-8, why is it not displayed when the error ?? If it is a Chinese character, it should not be output correctly .. And for example php file encoding for UTF-8, then the internal String type is UTF-8?
My answer is No.
Since the String does not support UTF-8, why is it not displayed when the error ??

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If it is a Chinese character, it should not be output correctly .. And for example php file encoding for UTF-8, then the internal String type is UTF-8?
My answer is No.
Since the String does not support UTF-8, why is it not displayed when the error ??

Php file encoding is u8, and string storage is also u8. do not believe you urlencode to check it. If the charset on your page is set to u8 in meta, the error will not be displayed. Try setting it to gbk to see if its error is correct.

I don't think it can be used as a variable name, function name, or parameter name?
Unicode is saved as a string, but its encoding is not parsed by php.