image is uploading in directory and in db also but when i refresh image disappear

database.php  // i know i should not to use mysql but i have the it into mysqli so no big issue in this
<?php
//Connection
$con=mysql_connect("localhost","root","");
if(!$con)
        echo "Failed to connect with MySQL.".mysql_error()."<br />";
//Create Database
$crt_db=mysql_query("CREATE DATABASE IF NOT EXISTS upload_images");
if(!$crt_db)
        echo "Error in creating Database.".mysql_error()."<br />";
//Select Database
mysql_select_db("upload_images");
if(mysql_error())
        echo "error in selecting database.".mysql_error()."<br />";
//Create Table
$crt_tbl=mysql_query("CREATE TABLE IF NOT EXISTS images(ID INT NOT NULL AUTO_INCREMENT,PRIMARY KEY(ID),image_name VARCHAR(255)) ");
if(mysql_error())
        echo "Error in creating table ".mysql_error()."<br />";
?>


image_upload.php

<html>
<head>
<title>Image Upload</title>
<style>
body {font-family:Verdana, Geneva, sans-serif;}
</style>
</head>

<body>
<?php
//error handler function
function catchError($errno, $errmsg, $a, $b, $c)
  {
  echo "<b>Error:</b> [$errno] <br />$errmsg<br />";
  echo "On Line=".$b;
  }

//set error handler
set_error_handler("catchError");

require ('database.php');

?>
<div style="position:fixed; right:5px; top:5px">
        <form method="post"><input type="submit" name="ds_btn" value="Destroy Session" /></form>
</div>
<?php

if(isset($_POST['submit']) && isset($_POST['hdn']))
{

        if(isset($_POST['hdn']))
        {
                for($j=1;$j<=3;$j++)
                {
                        if($_POST['hdn']==$j)
                                $code['img_name_'.$j]= $_FILES['file']['name'];
                }
        }
        $img_name= $_FILES['file']['name'];
        $img_type= $_FILES['file']['type'];
        $img_size= $_FILES['file']['size'];
        $img_tmp_path= $_FILES['file']['tmp_name'];
        $img_error= $_FILES['file']['error'];


        $allowedExts = array("gif", "jpeg", "jpg", "png");
        $temp = explode(".", $img_name);
        $extension = end($temp);

        if (    (       ($img_type == "image/gif")
        ||                      ($img_type == "image/jpeg")
        ||                      ($img_type == "image/jpg")
        ||                      ($img_type == "image/pjpeg")
        ||                      ($img_type == "image/x-png")
        ||                      ($img_type == "image/png"))
        &&              ($img_size < 2000000)
        && in_array($extension, $allowedExts))
        {
                if ($img_error > 0)
                {
                        echo "Return Code: " . $img_error . "<br>";
                }
                else
                {
                        if (file_exists("upload/".$img_name))
                        {
                                echo $img_name . " already exists. <br /><br />";
                        }
                        else
                        {
                                move_uploaded_file($img_tmp_path,"upload/".$img_name);
                                echo "Stored in: " . "upload/".$img_name."<br /><br />";
                                $updt=mysql_query("INSERT INTO images (image_name) VALUES('".$_FILES['file']['name']."')");
                                if($updt)
                                        echo 'Image name stored in database successfully.'."<br />";
                                else
                                        echo 'Error in updating image name in database. Error:'.mysql_error()."<br />";
                        }
                }
        }
        else
        {
                echo "Invalid file";
        }
}
for($i=1;$i<=3;$i++)
{
?>
<div style="border:1px solid black; width:220px; height:260px;; padding:5px; margin:10px; float:left">
    <form method="POST" enctype="multipart/form-data">
    <table>
        <tr>
            <td><input type="file" name="file" id="file"><br></td>
            <td><input type="hidden" name="hdn" value="<?php echo $i; ?>" /></td>
        </tr>
        <tr>
            <td><input type="submit" name="submit" value="Submit"></td>
        </tr>
    </table>
    </form>
                <?php
                for($k=1;$k<=3;$k++)
                {
                        if($i==$k && isset($code['img_name_'.$k]))
                        {
                                $sel=mysql_query("SELECT * FROM images WHERE image_name='".$code['img_name_'.$k]."'");
                                $row =  mysql_fetch_array($sel);
                                $code['i_'.$k]=$row['image_name'];  
                                echo '<img src="upload/'.$code['i_'.$k].'" height="180px" width="220px" />';

                        }
                }
                /*             
                        if($i==2 && isset($_SESSION['img_name_2']))
                        {
                                $sel=mysql_query("SELECT * FROM images WHERE image_name='".$_SESSION['img_name_2']."'");
                                $view = mysql_fetch_array($sel);
                                $_SESSION['i_2']=$view['image_name'];
                                echo '<img src="upload/'.$_SESSION['i_2'].'" height="180px" width="220px" />';
                        }
                        if($i==3 && isset($_SESSION['img_name_3']))
                        {
                                $sel=mysql_query("SELECT * FROM images WHERE image_name='".$_SESSION['img_name_3']."'");
                                $view = mysql_fetch_array($sel);
                                $_SESSION['i_3']=$view['image_name'];
                                echo '<img src="upload/'.$_SESSION['i_3'].'" height="180px" width="220px" />';
                        }
                */

        ?>
</div>
<?php
}
?>
</body>
</html>

session_start(); at the top of your page. You can't set/use $_SESSION variables without that function being called.

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