Send notification to multiple users function - php

Question

I have two different databases with table Phpfox_user , manual_userid and mobile table in them.There can be 3 users with same user_id but different mobile numbers stored in phpfox_user table and manual_userid and there GCM id in table mobile.(with mobile no column as well). Now i want to send notification to all mobile numbers with same user id .
Currently notification is only sent to a single manager only
function request_block($data){
//print_r($data);
$tower=new Tower;
$project=new Project;
$note=new Notification;
$fields=array('user_id', 'pay_opt', 'sale_type', 'hold_status', 'cost', 'is_manager_blocked', 'is_action_taken');
$params=array(
':user_id' => $data['user_id'],
':pay_opt' => $data['buy_opt'],
':sale_type' => $data['sale_type'],
':hold_status' => '1',
':cost' => $data['cost'],
':is_manager_blocked' => '0',
':is_action_taken' => '0',
':id' => $data['flat_id']
);
$where = 'where id= :id';
$tower->block_flat($fields, $params, $where);
$user_details=$tower->get_user_details($data['user_id']);
$flat_details=$tower->get_flat_details_cost($data['flat_id']);
$tower_main=$tower->get_tower_main_details($flat_details['tower_id']);
$project_details=$project->get_project_details($tower_main['project_id']);
$manager_details=$tower->get_user_details($project_details['manager_id']);
$manager_details=$tower->get_manualuser_details($project_details['manager_id']) ;
$mob_details=$tower->get_gcmid($manager_details['cf_mobile']);
$par['mobile']=$manager_details['cf_mobile'] ;
//print_r($flat_details); print_r($tower_main); print_r($project_details);
//$manager_details=$tower->get_user_details($project_details['manager_']);
$data['send_by']='user';
$data['user_id']=$data['user_id'];
$data['manager_id']=$project_details['manager_id'];
$data['message']='You have received a Booking request - by '.$user_details['full_name'].' '.$user_details['cf_mobile'].' for Flat no. '.$flat_details['flat_no'].' in '.$tower_main['tower_name'].' tower of '.$project_details['project_name'].' Project';
$data['msg_details']=$data['message'];
$data['notification_type']='user-to-manager';
$note->insert_notification($data);
$par['msg']=$data['message'];
if(count($mob_details)>=1 && $mob_details['gcmid']!='')
{
$fuck['notification_type']='user-to-manager';
$fuck['notification_text']=$par['msg'];
$fuck['user_id']=$data['user_id'];
$tt['message']=$fuck;
$tt['gcmid']=$mob_details['gcmid'];
send_notification($tt);
}
if(count($tower_images)>=1)
{
$result['data']=$tower_images;
} else {
$result['message']='No result found';
}
$result['message']='Flat block requested';
//print_array($par);
$result['status']='success';
send_sms($par);
$res=json_encode(array($result));
echo $res;}
These are the two functions that gets the user mobile numbers
public function get_user_details($user_id)
{
$params = array( ':user_id' => $user_id);
$sql = "SELECT * FROM phpfox_user, phpfox_user_custom where phpfox_user.user_id=phpfox_user_custom.user_id AND phpfox_user.user_id=:user_id";
$stmt = parent::query($sql, $params, '', 'main');
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) :
return $result[]=$row;
endwhile;
return $result;
}
public function get_manualuser_details($user_id)
{
$params = array( ':user_id' => $user_id);
$sql = "SELECT * FROM manual_userid where user_id=:user_id";
$stmt = parent::query($sql, $params);
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) :
return $res=$row;
endwhile;
return $result;}
public function get_gcmid($data)
{
$mobile=str_replace('+','0',$data);
$params = array( ':mobile' => $mobile);
$sql = "SELECT * FROM mobile where mobile=:mobile";
$stmt = parent::query($sql, $params);
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) :
return $res=$row;
endwhile;
}