$q4 = "SELECT domain_name,slots_config.bid FROM slots_pid,slots_config,slots_sites
WHERE slots_config.bid=slots_pid.bid && slots_sites.aid=slots_pid.aid";
$result4 = mysql_query($q4);

while($row = mysql_fetch_array($result4))
{
    $resultarray[] = $row;
}


if (in_array("test",$resultarray))
  {
  echo "Match found";
  }
else
  {
  echo "Match not found";
  }

$resultarray[0]['domain_name'] = 'first row domain name';
$resultarray[0]['bid'] = 'first row bid';
$resultarray[1]['domain_name'] = 'second row domain name';
...

$q4 = "SELECT domain_name,slots_config.bid FROM slots_pid,slots_config,slots_sites
WHERE slots_config.bid=slots_pid.bid && slots_sites.aid=slots_pid.aid";
$result4 = mysql_query($q4);

while($row = mysql_fetch_array($result4))
{
  if (in_array("test",$row))
  {
     echo "Match found";
  }
  else
  {
     echo "Match not found";
  }
}

$found = false;
 while($row = mysql_fetch_array($result4))
 {
    if (in_array($needle, $row){
      print "here it is";
      $found = true;
      break;
 }

 if (!$found) {
      print "not found";
 }