htmlspecialchars 只转化下面这几个html代码，而 htmlentities 却会转化所有的html代码，连同里面的它无法识别的中文字符也给转化了。
'&' (ampersand) becomes '&'
'"' (double quote) becomes '"' when ENT_NOQUOTES is not set.
''' (single quote) becomes ''' only when ENT_QUOTES is set.
'<' (less than) becomes '<'
'>' (greater than) becomes '>'
结论是，有中文的时候，最好用 htmlspecialchars ，否则可能乱码
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