Cannot modify header information - headers already sent by
有时候你在使用
header("Location: http://localhost/myblog/index.php/manager/listview");的时候会出现这个问题，可是也许你是从别处拷贝过来的
别处都没有出现过这个问题，这时候你就很疑惑了
注意
很可能是因为你在前面输出了一个echo的缘故
或者你在前面加上一个ob_start（）；可能够解决
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