save cookies with same name but different values in php -

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i designing real estate website have many ads in website , when user click on ad goes page viewmore.php gives user more details ad.

now see in viewmore.php file save ad's id in cookies , send ad's id favorite page , user can review post time or wants in favorite page.

the problem:

consider visit page localhost/viewmore.php?id=10 when go favorite page u see ad data belong id when visit ad localhost/viewmore.php?id=11 , go favorite page see ad data belong id=11 , previous add gone. want save both of them in favorite page or matter of fact save posts visit.

how can that? 

//reviewmore.php <!doctype html> <?php (is_numeric($_get['id'])) ? $id = $_get['id'] : $id = 1; ?> <?php  $cookie_name = "favoritepost"; $cookie_value ="$id"; setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // 86400 = 1 day ?> <html>   <body>     <?php  error_reporting(0); include("config.php"); (is_numeric($_get['id'])) ? $id = $_get['id'] : $id = 1; $result = mysqli_query($connect,"select*from ".$db_table." idhome = $id"); ?> <?php  error_reporting(0); include("config.php"); (is_numeric($_get['id'])) ? $id = $_get['id'] : $id = 1; $result = mysqli_query($connect,"select*from ".$db_table." idhome = $id"); ?> <?php $row = mysqli_fetch_array($result): $price=$row['price']; $rent=$row['rent']; $room=$row['room']; $date=$row['date']; ?> <?php  echo"price"; echo"room"; echo"date"; ?> </body>   </html>

favoritepage.php

<!doctype html> <html>   <body>  <?php  $cookie_name = "favoritepost"; ?> <?php  error_reporting(0); include("config.php"); $result = mysqli_query($connect,"select*from ".$db_table." idhome = $_cookie[$cookie_name]"); ?> <?php $row = mysqli_fetch_array($result): $price=$row['price']; $rent=$row['rent']; $room=$row['room']; $date=$row['date']; ?> <?php  echo"price"; echo"room"; echo"date"; ?>     </body>   </html>

store id's array in cookie example, have serialize()/unserialize() or json_encode()/json_decode() array cookie supports text , not complex data

<?php $id = is_numeric($_get['id']) ? $_get['id'] : 1;  $cookie_name = "favoritepost";  if ( isset($_cookie[$cookie_name]) ) {     $kookie = unserialize($_cookie[$cookie_name]); } else {     $kookie = array(); } if ( ! in_array($id, $kookie) ) {     $kookie[] = $id; }  setcookie($cookie_name, serialize($kookie), time() + (86400 * 30), "/"); // 86400 = 1 day ?> <html>

now last cookie entered assume 1 want use in query 

<!doctype html> <html> <body> <?php $cookie_name = "favoritepost"; include("config.php"); if ( ! isset($_cookie[$cookie_name]) ) {     echo 'no cookie set';     exit; }  $kookie = unserialize($_cookie[$cookie_name]); $id = $kookie[count($kookie)-1]; $result = mysqli_query($connect,"select * $db_table idhome = $id");  $row = mysqli_fetch_array($result): $price=$row['price']; $rent=$row['rent']; $room=$row['room']; $date=$row['date'];  echo"price"; echo"room"; echo"date"; ?>

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