iconv函数和mb_convert_encoding函数转码的问题
这两个函数各有特点，
1、iconv速度快，自然优先选择，但是他有个缺点，如果遇到自己不能转换的字符，就从那里截断。这就导致转码中内容被无故截断。
2、mb_convert_encoding函数效率比较低，但是他遇到无法转换的内容不会截断，这很大程度保留了内容的完整性。但是我发现比如内容有空格，转换出来的内容就有？符号，还是不够完美。
如何结合这两个函数对字符进行转码？
我的思路是这样的：
优先肯定使用iconv函数，因为效率高，而且是内置函数。discuz的转码函数也是优先使用此函数，但是他转码不完整的情况下，就要安排mb_convert_encoding去收拾残局了，问题来了，如何判断他转码不完整？
------解决方案--------------------
虽然 mb_convert_encoding函数 需要加载 php_mbstring 扩展
但加载了就不能说不是内置函数了
对于不可识别的字符，iconv 提供了两个开关供你选用，并不是一味的截断
//TRANSLIT 用相近的字符替代
//IGNORE 丢弃并继续
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