I want to add 30 days to mysql date row - php

Question

My Code.
<?php //data.php
require_once 'db.php';
// Get values from form
$Fname = $_POST['first_name'];
$Lname = $_POST['last_name'];
$web = $_POST['web'];
$email = $_POST['email'];
$date = $_POST['date'];
// Insert data into mysql
$sql="INSERT INTO users (first_name, last_name, web, email, date)
VALUES ('$Fname', '$Lname', '$web', '$email', '$date', NOW())";
$result = mysql_query($sql);
$sql="SELECT DATE_ADD('$date', INTERVAL 30 day)";
$result = mysql_query($sql);
// if successfully insert data into database, displays message "Successful".
if($result){
header('Location: ../index.php');
}
else {
echo "ERROR";
}
// close mysql
mysql_close();
?>
My problem, i want to add those 30 days to the date column in database when form execute`s this file and inserts fname in fname, web in web, and date in date + 30 interval.
Thank you.
$sql="INSERT INTO users (first_name, last_name, web, email, date)
VALUES ('$Fname', '$Lname', '$web', '$email', '$date', NOW())";
$result = mysql_query($sql);
***$sql="SELECT DATE_ADD('$date', INTERVAL 30 day)";
$result = mysql_query($sql);***

Answer 1

Use the following query :
$sql="INSERT INTO users (first_name, last_name, web, email, date)
VALUES ('$Fname', '$Lname', '$web', '$email',DATE_ADD('$date', INTERVAL 30 day) , NOW())";

Answer 2

Do like this...
$sql="INSERT INTO `users` (`first_name`, `last_name`, `web`, `email`, `date`)
VALUES ('$Fname', '$Lname', '$web', '$email', DATE_ADD('$date', INTERVAL 30 DAY))";

Answer 3

Try this:
$sql="INSERT INTO users (first_name, last_name, web, email, date)
VALUES ('$Fname', '$Lname', '$web', '$email', '$date', DATE_ADD(NOW(), INTERVAL 30 DAY))";
$result = mysql_query($sql);
>> you are adding date after query executes, but do the same when query executes.
Thanks

Answer 4

Here is the part you need to change
$sql="INSERT INTO users (first_name, last_name, web, email, date)
VALUES ('$Fname', '$Lname', '$web', '$email', '$date', NOW() + INTERVAL 30 DAY)";