[PHP] Copy image from a website to another?

[Lic. Carlos A. Triana Torres]

Hello all,
    I am learning php and I am trying to make a very simple script so as to
download a jpg from one site I manage to another that I also manage. It
would be, get a jpg from http://www.first_site.com/image.jpg and put in to
http://www.second_site.com/image.jpg. I have tried this, but the only way it
works is if I give the absolute path to the
file...($file_name="/usr/local/htdocs/...image.jpg") but how can I make it
work with the URL?
    Thanks for your suggestions...

<?
$file_name="http://www.first_site.com/image.jpg";
 if(isset($upload)){copy($file, "uploads/$dir/$file_name");  }
?>
<table border="0" width="80%" cellspacing="5" cellpadding="5">
    <form action="<?=$PHP_SELF;?>" method="post"
enctype="multipart/form-data">
        <tr>
            <td colspan="2"><input type="hidden" name="max_tam"
value="100000"><input type="submit" name="upload" value="Upload"></td>
        </tr>
    </form>
</table>




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