Form data sent via POST method gets empty-CodePudding

I am posting the "user" variable to another page i.e. Survey.php as follows:

index.html

<form action="Survey.php" method="post" name="frm">
  <div><input type="text" name="user"></div>
  <div><input type="submit" value="Start" ></div>
</form>

I can access the "user" variable on Survey.php page on its first load. Now, because I have another form on this page as well, which posts data to itself.

Survey.php

$user = $_POST["user"];
echo 'this is '.$user;
$email = $_POST[email];
if($_SERVER['REQUEST_METHOD'] == 'POST'){
$sql = "INSERT INTO `test_db` (`user`, `email`) VALUES '$user', '$email');";
echo $sql;
}
<form action="survey.php" method="post">
  <div><input type="text" name="email"></div>
  <div><input type="submit" value="submit" ></div>
</form>

I am trying to send "user" and "email" together to the database now. What happens actually is that everytime I click on submit button of the survey.php page, the "user" variable gets empty.

CodePudding user response：

You have to test your posts DATA and user Sesssion. In your PHP code, you can have something like that

<?php
session_start();
if(isset($_POST['user']))
  $_SESSION['user'] = $_POST['user'];
if(isset($_POST['email']))
  $_SESSION['email'] = $_POST['email'];
if(isset($_SESSION['user']) AND isset($_SESSION['email'])){
   $sql = "INSERT INTO `test_db` (`user`, `email`) VALUES '$_SESSION['user']', '$_SESSION['email']');";
  echo $sql;
}

If you don't want to use sessions, you can play with your form like this :

$user = $_POST["user"];
echo 'this is '.$user;
$email = $_POST[email];
if($_SERVER['REQUEST_METHOD'] == 'POST'){
$sql = "INSERT INTO `test_db` (`user`, `email`) VALUES '$user', '$email');";
echo $sql;
}
<form action="survey.php" method="post">
  <div><input type="text" name="email"></div>
  <div><input type="submit" value="submit" ></div>
  <input type="hidden" name="user" value="<?php echo $user; ?>">
</form>

CodePudding user response：

You have $user and $email as variable then why are you putting them as strings? The below code should work -

$user = $_POST["user"];
echo 'this is '.$user;
$email = $_POST[email];
if($_SERVER['REQUEST_METHOD'] == 'POST'){
$sql = "INSERT INTO `test_db` (`user`, `email`) VALUES '" . $user . "', '" . $email . "');";
echo $sql;
}
<form action="survey.php" method="post">
  <div><input type="text" name="email"></div>
  <div><input type="submit" value="submit" ></div>
</form>