How to delete a file on apache using PHP?

Hi everybody,
>
I'm trying to remove a file when an upload is complete. Now, if the
file doesn't meet some requriements then must get deleted.
>
1) The problem is that I'm getting an error as:
>
PHP Fatal error: *Call to undefined function ulink() in /var/www/html/
app/upload.php on line 42
>
if (!ulink($uploaded_file)) * //this line 42 * <====
{
* * error_log("Notice: Couldn't delete file ". $uploaded_file, 0, "/
var/www/html/.../report.log");}
>
else
{
* *error_log("Info: Suspicious file ". $uploaded_file . " removed by
the system.",
>
}
>
Thanks.