Es mas .. fijate que "graciosos" los chicos de php.net al describir la funcion delete() (por si la buscas en el manual de PHP):
Cita: delete
See unlink or unset ()
void delete ( string file )
This is a dummy manual entry to satisfy those people who are looking for unlink() or unset() in the wrong place.
See also: unlink() to delete files, unset() to delete variables.
Un saludo,