Material Wallpaper (api.php)

<?php

    include_once ('includes/variables.php');

    $connect->set_charset('utf8');

    if(isset($_GET['cat_id']))
    {

            $query="SELECT image AS 'images', category_name AS 'cat_name', cid, category_image FROM tbl_category c, tbl_gallery n WHERE c.cid=n.cat_id and c.cid='".$_GET['cat_id']."' ORDER BY n.id DESC";
            $resouter = mysqli_query($connect, $query);;

    }
    else if(isset($_GET['latest']))
    {
            $limit=$_GET['latest'];

            $query="SELECT * FROM tbl_category c,tbl_gallery n WHERE c.cid=n.cat_id ORDER BY n.id DESC LIMIT $limit";
            $resouter = mysqli_query($connect, $query);
    }
    else if(isset($_GET['custom_category']))
    {
            $query = "SELECT * FROM tbl_category c, tbl_gallery n WHERE c.cid = n.cat_id AND c.category_name = 'Nature' ORDER BY n.id DESC";
            $resouter = mysqli_query($connect, $query);
    }
    else
    {
            $query="SELECT * FROM tbl_category ORDER BY cid DESC";
            $resouter = mysqli_query($connect, $query);
    }

    $set = array();

    $total_records = mysqli_num_rows($resouter);
    if($total_records >= 1){

      while ($link = mysqli_fetch_array($resouter, MYSQLI_ASSOC)){

        $set['MaterialWallpaper'][] = $link;
      }
    }

     header( 'Content-Type: application/json; charset=utf-8' );
     echo $val= str_replace('\\/', '/', json_encode($set));


?>