What's the difference between UTF8 and UTF-8?

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"UTF-8" is the standard notation, the English is not case-sensitive under windows, so it can also be written as "Utf-8". "UTF-8" can also be the middle of "-" omitted, written as "UTF8". General procedures can be identified, but there are exceptions (the following article), in order to be strict, it is best to use the standard capitalization "UTF-8".

Only "UTF8" can be used in MySQL database

In the MySQL command mode can only use "UTF8", Can not use "utf-8", that is, in the PHP program can only use "Set names UTF8 (no small bars)", if you add "-" this line command will not take effect, but in PHP header is added "- Because IE does not know the "UTF8" of the bar, the reason is below.

Only use "Utf-8" in IE browser

If "UTF8" is used in IE, the page may appear blank or garbled.

But in other browsers is normal, because: the other browser by default is UTF-8 encoding, if not recognized page encoding will be used by default UTF-8 to decode, but IE's default encoding is GB2312, so the default is .... (Other browsers refer to "FireFox", "Chrome", "Opera")

Summarize　　

"Utf-8" can only be used in MySQL with the alias "UTF8", but in other places use uppercase "UTF-8". 】

The specific:

Use uppercase "UTF-8" outside the Command "mysql_query (set names UTF8)".

What's the difference between UTF8 and UTF-8?