Post Answer <?php include ("connection.php"); $result = ...

Passing parameter through “window.location.href”

<!doctype html>
<html>
  <head>
    <title>Post Answer</title>
  </head>
  <body>
    <?php
    include ("connection.php");

      $result = mysqli_query($con, "SELECT * FROM student_table WHERE SID='$_POST[sid]'") or die('Query failed');
      $tmp = mysqli_fetch_array($result);
      $nn = $tmp['nickname'];
      $a = $_POST['answer'];
      $sid = $tmp['SID'];
      $c = $tmp['course'];
      $q_id = $_POST['q_id'];
      $sql = mysqli_connect("127.0.0.1", "root", "", "project");
      $sql = "INSERT INTO answer_table (nickname, answer, SID, vote, course) VALUES ('$nn', '$a', '$sid', '', '$c')";

      if (!mysqli_query($con, $sql)) {
        die('Error: ' . mysqli_error($con));
      }

      echo ("<SCRIPT LANGUAGE='JavaScript'>
                window.location.href='question.php';
                window.alert('Thank You! Your answer is online now.')
                  </SCRIPT>");
    ?>
  </body>
</html>

At question.php file, I want to receive $q_id as $_GET['q_id']

Can I pass $q_id of line 17 to question.php page of line 26?

Answer

Just add it in as a query string in the javascript

echo ("<script language='JavaScript'>
         window.location.href='question.php?q_id=$q_id';
         window.alert('Thank You! Your answer is online now.')
       </script>");

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Answer