PHP Find nested associative array set by assc's Key & Value

function find_nested_assc_array_set_by_key($set = array(), $key, $lookfor, $very_similiar = true)
{
    if(empty($set))
    {
        return $set;
    }

    foreach($set as $index => $st)
    {
        if(array_key_exists($key, $st) === false)
        {
            continue;
        }

        if($very_similiar)
        {
            if( (!empty($st[$key])) && ($st[$key] == $lookfor) )
            {
                return $st;
            }
        }
        else
        {
            if( (!empty($st[$key])) && (strpos(strtolower($st[$key]),  strtolower($lookfor)) !== false) )
            {
                return $st;
            }
        }
    }

    return false;
}