关于编码的一些问题
一般哪些情况下是需要进行编码转换的？页面显示，获取内容，保存到数据库等一些操作
另外，假如我的PHP文件是UTF-8格式的，那么获取一个网页为GBK字符的内容，是不是需要转换？
回复讨论(解决方案)
页面显示，获取内容，保存到数据库，还有文件本身的格式都保持一致就好，没必要转换，也不会出现乱码
PHP文件是UTF-8格式的，那么获取一个网页为GBK字符的内容，是需要转换的
如果你想输出utf-8编码的字符时则是需要转化的，还有如果想存入utf8编码的数据时也是需要转化的。
凡是程序输出编码与外部数据编码不一致时，都需要对外部数据做编码转换
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