Excuse me, why can't I change the redirection address after I redirect a url?

Ask the gods: why can't I change the redirection address after redirecting a url? Source code: index. phpPHPcode & lt ;? Php // redirectthecurrentrequestifnecessaryrequire_once 'include/url_redirect
Source code:
Index. php

PHP code

  
  
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Function fix_index_url ()

PHP code

   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(); }

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The address after the redirection cannot be changed?
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Location to google
If the url is changed, it is also a problem with your browser.