请问大神：为何小弟我对一个url重定向后就无法更改重定向的地址了

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 function fix_index_url()
 {
     if(preg_match('#(.*)index\.(php|html)$#', $_SERVER['REQUEST_URI'], $captures))
     {
         //perform a 301 redirect to the new URL
         header('HTTP/1.1 301 Moved Permanently');
         header('Location:' . "http://localhost/seophp");
     }
//    exit();
 }