HOW TO upload image and retrive image using ajax

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db.php:- for database connection

<?php$mysql_hostname = "localhost";$mysql_user = "root";$mysql_password = "";$mysql_database = "test";$prefix = "";$bd = mysql_connect($mysql_hostname, $mysql_user, $mysql_password) or die("Opps some thing went wrong");mysql_select_db($mysql_database) or die("Opps some thing went wrong");
?>

image.php:- its for uploading image

<?php

include('db.php');

session_start();

$session_id='1'; //$session id

$path = "uploads/";

$valid_formats = array("jpg", "png", "gif", "bmp","JPG");

if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST")

{

$name = $_FILES['photoimg']['name'];

$size = $_FILES['photoimg']['size'];

if(strlen($name))

{

list($txt, $ext) = explode(".", $name);

if(in_array($ext,$valid_formats))

{

if($size<(1024*1024))

{

$actual_image_name = time().substr(str_replace(" ", "_", $txt), 5).".".$ext;

$tmp = $_FILES['photoimg']['tmp_name'];

if(move_uploaded_file($tmp, $path.$actual_image_name))

{

mysql_query("UPDATE users SET profile_image='$actual_image_name' WHERE uid='$session_id'");

echo "<img src='uploads/".$actual_image_name."'  class='preview'>";

}

else

echo "failed";

}

else

echo "Image file size max 1 MB";

}

else

echo "Invalid file format..";

}

else

echo "Please select image..!";

exit;

}

?>