表单处理后 PHP 重定向

我一直盯着代码太久了，但是当我使用一个简单的脚本来保存表单时：

endif;
header('Location: http:/mysite.com/evo/codesaveindex.php');
?>

最后，页面重定向回自身很好，但是现在我这里有一个更长的脚本，我无法弄清楚在哪里或如何编码我的重定向：

<?php
  session_start();
  $directory = 'users/'.$_SESSION['username'].'/';
  //here you can even check if user selected 'Delete' option:
  if($_POST['Action'] == "DELETE"){
      $file_to_delete = $_POST['CodeList'];
      if(unlink($directory.'/'.$file_to_delete))
         echo $file_to_delete." deleted.";
      else
         echo "Error deleting file ".$file_to_delete;
  }
   if($_POST['Action'] == "SAVE"){
     //  If a session already exists, this doesn't have any effect.
session_start();
//  Sets the current directory to the directory this script is running in
chdir(dirname(__FILE__));
//  Breakpoint
if( empty($_SESSION['username']) || $_SESSION['username'] == '' ) echo 'There is no session username';
if( empty($_POST['CodeDescription']) || $_POST['CodeDescription'] == '' ) echo 'There is no POST desired filename';
//  This is assuming we are working from the current directory that is running this PHP file.
$USER_DIRECTORY = 'users/'.$_SESSION['username'];
//  Makes the directory if it doesn't exist
if(!is_dir($USER_DIRECTORY)):
    mkdir($USER_DIRECTORY);
endif;
//  Put together the full path of the file we want to create
$FILENAME = $USER_DIRECTORY.'/'.$_POST['CodeDescription'].'.txt';
if( !is_file( $FILENAME ) ):
    // Open the text file, write the contents, and close it.
    file_put_contents($FILENAME, $_POST['Code']);   
   endif;
   }
  ?>