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old code

<?php

include('database.php');

if (isset($_POST["addtocart"])) {

    // Connect to the database

    // Check connection

    // Escape user inputs for security

    $cartid = $_SESSION["email"];

    $title = mysqli_real_escape_string($con, $_POST['title']);

    $vendor_id = mysqli_real_escape_string($con, $_POST['vendor_id']);

    $description = mysqli_real_escape_string($con, $_POST['description']);

    $insert_category = mysqli_real_escape_string($con, $_POST['insert_category']);

    $location = mysqli_real_escape_string($con, $_POST['location']);

    $price = mysqli_real_escape_string($con, $_POST['price']);

    $image = mysqli_real_escape_string($con, $_POST['image']);

    $sql = "INSERT INTO cart (cart_id,vendor_id,title, description, category, location, price,image)

            VALUES ('$cartid','$vendor_id','$title', '$description', '$insert_category', '$location', '$price','$image')";

    if (mysqli_query($con, $sql)) {

        // echo "record added";

       header("Location: " . $_SERVER['REQUEST_URI']);

     

    } else {

        echo "ERROR: Could not able to execute $sql. " . mysqli_error($con);

    }

    // Close connection

    mysqli_close($con);

}

?>

Modify code:

<?php

include('database.php');

if (isset($_POST["addtocart"])) {

    // Connect to the database

    // Check connection

    // Escape user inputs for security

    $cartid = $_SESSION["email"];

    $title = mysqli_real_escape_string($con, $_POST['title']);

    $vendor_id = mysqli_real_escape_string($con, $_POST['vendor_id']);

    $description = mysqli_real_escape_string($con, $_POST['description']);

    $insert_category = mysqli_real_escape_string($con, $_POST['insert_category']);

    $location = mysqli_real_escape_string($con, $_POST['location']);

    $price = mysqli_real_escape_string($con, $_POST['price']);

    $image = mysqli_real_escape_string($con, $_POST['image']);

    $sql = "INSERT INTO cart (cart_id,vendor_id,title, description, category, location, price,image)

            VALUES ('$cartid','$vendor_id','$title', '$description', '$insert_category', '$location', '$price','$image')";

    if (mysqli_query($con, $sql)) {

        // echo "record added";

       //header("Location: " . $_SERVER['REQUEST_URI']);

     

       echo "<script>window.location.href = window.location.href;</script>";

        exit;

    } else {

        echo "ERROR: Could not able to execute $sql. " . mysqli_error($con);

    }

    // Close connection

    mysqli_close($con);

}

?>

Add javascript to rediret url.