PHP: give alert popup then redirect the page

- 
code goes this  
 
if($_FILES['file']['size'] > 200000) //any file size, 200 kb in this case
{
 echo "<script type='javascript'>alert('File size larger than 200 KB')</script>";
}
header("Location: index.php");
 
 
 
 
The browser will be redirected to index.php page anyway, no
 matter the file is successfully uploaded or not. Its just that the 
popup will appear if the file is of larger size.

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