Para resolver los errores con la función preg_replace() en symfony 1.4

gistfile1.php

/*
Para resolver los errores con la función preg_replace() en symfony 1.4:
Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead...

http://stackoverflow.com/questions/18077276/symfony-1-4-using-deprecated-functions-in-php-5-5/18086043#18086043
*/


/*
In myproject/lib/vendor/symfony/lib/response/sfWebResponse.class.php on line 409, I have now (commented code is original Symfony code):
*/

  protected function normalizeHeaderName($name)
  {
    // return preg_replace('/\-(.)/e', "'-'.strtoupper('\\1')", strtr(ucfirst(strtolower($name)), '_', '-'));    

    return preg_replace_callback(
                  '/\-(.)/', 
                  function ($matches) {
                    return '-'.strtoupper($matches[1]);
                  }, 
                  strtr(ucfirst(strtolower($name)), '_', '-')
        );
  }

/*
And in myproject/lib/vendor/symfony/lib/util/sfToolkit.class.php on line 362 we get:
*/

 public static function pregtr($search, $replacePairs)
  {
    // return preg_replace(array_keys($replacePairs), array_values($replacePairs), $search);
    foreach($replacePairs as $pattern => $replacement)
        $search = preg_replace_callback(
                    $pattern, 
                    function ($matches) use ($replacement){
                        if(array_key_exists(1, $matches)){ $replacement = str_replace("\\1", $matches[1], $replacement);}
                        if(array_key_exists(2, $matches)){ $replacement = str_replace("\\2", $matches[2], $replacement);}
                        return $replacement;
                    }, 
                    $search
                );
    return $search;
  }

Hello, Hey friend, Can I do a question?
Where should I put this code for the correct the error?
Thank you so much your help