Uploaded the files.

review.php

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+<?php
+session_start();
+include "db.php";
+if (isset($_POST["review"])) {
+
+	$name = $_POST["name"];
+	$email = $_POST["email"];
+	$review = $_POST['review'];
+	$rating = $_POST['rating'];
+	$product_id =$_POST['product_id'];
+    $datetime =  date('Y-m-d H:i:s');
+		
+		$sql = "SELECT review_id FROM reviews WHERE email = '$email' AND product_id = '$product_id' ";
+		$check_query = mysqli_query($con,$sql);
+		$count_email = mysqli_num_rows($check_query);
+		if($count_email > 0){
+			echo "
+				<div class='alert alert-danger'>
+					<a href='#' class='close' data-dismiss='alert' aria-label='close'>&times;</a>
+					<b>Multiple reviews are not Allowed</b>
+				</div>
+			";
+			exit();
+		}else{
+			$sql = "INSERT INTO `reviews` (`review_id`, `product_id`, `name`, `email`, `review`, `datetime`, `rating`) 
+			VALUES  (NULL, '$product_id','$name', '$email', 
+			'$review','$datetime', '$rating')";
+			
+			if(mysqli_query($con,$sql)){
+				echo "Thanks for Better reach ";
+				echo "<script> location.href='product.php?q=$product_id'; </script>";
+				exit;
+			}else {
+				echo "something went wrong";
+			}
+		}
+	
+}
+
+
+
+?>
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