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Detailed explanation of the differences between several writing methods of UTF-8

零下一度

Jun 30, 2017 am 10:09 AM

quotutf-8utf8

<span style="font-family: Microsoft YaHei; font-size: 14px">本质上没有区别。<br/>1.<span style="color: #ff0000">“UTF-8”</span>是标准写法;<br/>2.在Windows下边英文不区分大小写，所以也可以写成<span style="color: #ff0000">“utf-8”</span>;<br/>3.“UTF-8”也可以把中间的“-”省略，写成<span style="color: #ff0000">“UTF8”</span>。一般程序都能识别，但也有例外（如下文）:<br/><br/>　　为了严格一点，最好用标准的大写“UTF-8”。</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">　　在MySQL数据库中只能使用“utf8”</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">　　在MySQL的命令模式中只能使用<span style="color: #ff0000">“utf8”</span>，不能使用“utf-8”，也就是说在PHP程序中只能使用“set names utf8(不加小横杠)”，如果你加了“-”此行命令将不会生效，但是在PHP中header时却要加上“-”，因为IE不认识没杠的“utf8”，原因 见下文。</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">4.在IE浏览器中只能使用“utf-8”</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">　　IE中如果使用了“utf8”，页面可能会 空白 或 显示为乱码。</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">　　但是在其它浏览器却是正常的，原因是因为：其它浏览器默认使用的是UTF-8的编码，如果无法识别页面的编码就会用默认的UTF-8来解码，但 是IE的默认编码是GB2312，所以默认的话就。。。。。（其它浏览器指“FireFox”、“Chrome”、“Opera”）</span><br/><br/><br/><span style="font-family: Microsoft YaHei; font-size: 14px; color: #339966"><span style="color: #ff0000"><strong>总结</strong></span>　　</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">　　【只有在MySQL中可以使用“utf-8”的别名“utf8”，但是在其他地方一律使用大写“UTF-8”。】</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">　　具体为：</span><br/><span style="font-family: Microsoft YaHei; font-size: 14px">　　　　<span style="color: #ff0000">在命令“mysql_query(set names utf8)”外一律用大写“UTF-8”。</span></span>

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