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What is the difference between utf8 and UTF-8

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Release： 2016-07-25 08:54:18
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  2. header('Content-type: text/html; charset:UTF-8');
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HTML document:

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MySQL statement:

  2. 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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utf8与UTF-8有什么区别
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