I'm not even sure if I understand what you are trying to do.
However, remember that PHP is a server-side scripting language. It knows absolutely nothing of the client machine. You cannot directly access a file from the local computer, and then copy it to the server. (It would be kind of stupid if everyone could steal your documents without you knowing, wouldn't it?)
The only solution for this, is to use some sort of file upload function. For instance, you can use;
<form action="uploadfile.php" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFile">
</form>
And then write an 'uploadfile.php' script that handles the file upload. Check the PHP manual for details;
http://www.php.net/manual/en/features.file-upload.php
