display only if has group of numbers - php

Question

I need to return list with prices only if there have groups i try already if else empty not !=
nothing help any suggestions ?
$usergroups = '11,9,10';
if (empty($usergroups)) {
return;
}
$fields = 'MIN(IF(prices.percentage_discount = 0, prices.price, prices.price - (prices.price * prices.percentage_discount)/100)) as price, prices.usergroup_id as usergroup_id, ud.usergroup as usergroup_name';
$condition = db_quote(' prices.product_id = ?i AND prices.usergroup_id IN (?p) AND ud.lang_code = ?s', $product['product_id'], $usergroups, DESCR_SL);
$group_by = 'usergroup_id';
$join = '?:usergroup_descriptions as ud ON ud.usergroup_id = prices.usergroup_id';
$opt_prices = db_get_array("SELECT ?p FROM ?:product_prices as prices LEFT JOIN ?p WHERE ?p GROUP BY ?p", $fields, $join, $condition, $group_by);
$currencies = Registry::get('currencies');
foreach ($opt_prices as &$price) {
$price['current'] = 0;
if (in_array($price['usergroup_id'], $auth['usergroup_ids'])) {
$price['current'] = 1;
$product['price'] = $price['price'];
}
$price['price'] = number_format($price['price'], 2, '.', ' ') . ' $';
}
$product['group_discounts'] = $opt_prices;
}
So i want display $product['group_discounts'] = $opt_prices;
only if there is $usergroups = '11,9,10';

Answer 1

Answer your comment:
You used that but ok here an example :
<?php
$usergroups = array('11','9','10');
$opt_prices='11';
if (in_array($opt_prices,$usergroups)){
echo 'yes';
}else{
echo 'no';
}
?>