用CI框架时，有时候会遇到这么一个问题，打开网页，只显示 Disallowed Key Characters 错误提示。有人说 url 里有非法字符。但是确定 url 是纯英文的，问题还是出来了。但清空浏览器历史记录和cookies后。 刷新就没问题了。有时候。打开不同的浏览器。有的浏览器会有问题。有的就不会。
解决 CodeIgniter 框架应用中，出现Disallowed Key Characters错误提示的方法。找到/system/core文件夹下的Input文件，将下面的代码：
<span function> _clean_input_keys(<span><span><span if> ( ! <span preg_match>("/^[a-z0-9:_\/-]+$/i", <span><span><span exit>('Disallowed Key Characters.'<span><span><span clean utf-8 if supported>
<span if> (UTF8_ENABLED === <span true><span><span> = <span>->uni->clean_string(<span><span><span return> <span><span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>改为：
<span function> _clean_input_keys(<span><span><span> = &get_config('config'<span><span if> ( ! <span preg_match>("/^[".<span>['permitted_uri_chars']."]+$/i", <span rawurlencode>(<span><span><span exit>('Disallowed Key Characters.'<span><span><span clean utf-8 if supported>
<span if> (UTF8_ENABLED === <span true><span><span> = <span>->uni->clean_string(<span><span><span return> <span><span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>参考：http://www.nowamagic.net/librarys/veda/detail/1699
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