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What is the difference between utf8 and UTF-8

WBOYOriginal: 2016-07-25 08:54:181329browse

header('Content-type: text/html; charset:UTF-8');

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HTML document:

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MySQL statement:

mysql_query("set names utf8");

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Summary: Use the alias "utf8" of "utf-8" in MySQL, and always use uppercase "UTF-8" elsewhere.

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What is the difference between utf8 and UTF-8

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