Tightening up an array search

[OhLordy]

Hi, just wondering if anyone has any ideas on how I might be able to tighten up this array search it seems like it's doing more iterations than are nececarry (if it's obvious please don't laugh at me 🙁 )

for($i=0;$i<count($PAGE_VARIABLES['details_array']);$i++)
{
    $PAGE_VARIABLES['in_array']==false;
    for($j=0;$j<count($PAGE_VARIABLES['top_details']);$j++)
    {
        if($PAGE_VARIABLES['details_arrar'][$i]['manufacturer_id']==$PAGE_VARIABLES['top_details'][$j]['manufacturer_id'])
            $PAGE_VARIABLES['in_array']==true;
    }
    $PAGE_VARIABLES['in_array']?(""):($PAGE_VARIABLES['man_hold'][]=$PAGE_VARIABLES['details_array'][$i]);
}
$PAGE_VARIABLES['details_array']=$PAGE_VARIABLES['man_hold'];

Cheers
Rob