<?php

if($_SERVER['REQUEST_METHOD']=='GET'){

    $user_id  = $_GET['user_id'];

    require_once('dbConnect.php');

    $user_tags = array();

           foreach ($_REQUEST['user_id'] as $key => $val) {
           $user_tags[$key] = filter_var($val, FILTER_SANITIZE_STRING);
            }
            $user_ids = "'" . implode("','", $user_tags) . "'";
            $sql = "SELECT * FROM user_tags WHERE user_id IN ({$user_ids})";

    $r = mysqli_query($con,$sql);

//creating a blank array
$result = array();

//looping through all the records fetched
while($row = mysqli_fetch_array($r)){

    //Pushing name and id in the blank array created
    array_push($result,array(
        "tags"=>$row['tags']
    ));
}

//Displaying the array in json format
echo json_encode(array('result'=>$result));

mysqli_close($con);
 }

$result['tags'][] = $row['tags'];