- in_array: documentation ( source)
<?php
$jackpots = array(
'2'=>'Lots a Loot',
'2-5reel'=>'Lots a Loot 5 Reel',
);
$selected = array('2-5reel');
foreach($jackpots as $id => $name){
if(in_array($id,$selected)){
echo 'fuck'.$id.'<br />';
}
}