function
unique_rand(
$min
,
$max
,
$num
) {
$count
= 0;
$return
=
array
();
while
(
$count
<
$num
) {
$return
[] = mt_rand(
$min
,
$max
);
$return
=
array_flip
(
array_flip
(
$return
));
$count
=
count
(
$return
);
}
shuffle(
$return
);
return
$return
;
}