I am workng on a project in which I have to put back button functionality. Unfortunatly I can't seem to work it out. I have created a back button and it works. But if the user wants to edit the previous form and then submit data again, so it edits the query. I have tried it in my project but it adds another record in the database and doesn't update the previous one. I know I am not using any update query here. Now I am stuck how would it works I can't think of a good logic. I have made a simple form for example. It is written below.
<?php
$con = mysqli_connect('localhost','root','','test1');
if (isset($_POST['sub'])) {
$first_name = $_POST['fname'];
$second_name = $_POST['lname'];
$sql = "INSERT INTO `tbl`(`first_name`, `last_name`) VALUES
('$first_name', '$second_name')";
$run = mysqli_query($con, $sql);
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method="POST" action="nextpage.php">
First_name: <input type="text" name="fname">
Second_name: <input type="text" name="lname">
<input type="submit" name="sub" value="submit">
</form>
</body>
</html>
nextpage.php
<?php
$con = mysqli_connect('localhost','root','','test1');
?>
<html>
<body>
<h1>Next Page</h1>
<p>The query is submitted press ok to forward and back if you want to go back</p>
<button>OK</button>
<button onclick="history.go(-1);">Back</button>
</body>
</html>
Thanks for your expert advice in advance.
