HTML Forms in PHP

Question

i am writing html form code with in php script

here it is

Answer 1

You should specify a method of form submit.

$problem_code="STR";
echo '<form method=post name="submit-button" action="/codejudge/submit.php?id='.$problem_code.'">';
echo '<button type="submit" >Submit</button>';
echo "</form>";

Answer 2

If a form is method="GET" (which is the default), as this one is, then submitting it will erase the existing query string in the action.

Store the data in a hidden input instead.

<?php
  $problem_code="STR";
?>
<form name="submit-button" action="/codejudge/submit.php">
  <input type="hidden" name="id" value="<?php echo htmlspecialchars($problem_code); ?>">
  <button type="submit">Submit</button>
</form>