Showing file field value with PHP

Hi does anyone know in PHP a way of showing the value of a file input form element? I have built an application which allows a user to select a news entry record to edit. This record has links to documents which were entered using <input type=file> fields. When I show the edit form I want the user to be able to modify these not see empty form fields (they may then think that the fields are empty and reselect again). Thanks Steven