PHP iconv 函数转gb2312的bug解决方法_PHP
iconv( "UTF-8", "gb2312//IGNORE" , $FormValues['a'])
ignore的意思是忽略转换时的错误，发现iconv在转换字符"—"到gb2312时会出错，如果没有ignore参数，所有该字符后面的字符串都无法被保存。
另外mb_convert_encoding没有这个bug，所以最好的写法是:
mb_convert_encoding($FormValues['a'], "gb2312", "UTF-8");
但是需要先enable mbstring 扩展库。
也可以把mysql数据库的collation设成utf-8就不用作转换了
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