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  1. <?PHP
  2.  
  3. for ($u = 1; $u <= $_GET['amount']; $u++) {
  4. $_SESSION['u'.$u.'_first_name'] = $_GET['u'.$u.'_first_name'];
  5. echo 'session : '.$_SESSION['u'.$u.'_first_name'].'<br>';
  6. }
  7.  
  8. echo '
  9. <form action="" id="formBook">
  10. Amount : <input id="amount" name="amount" value="'.$_GET['amount'].'"><br>
  11. ';
  12.  
  13. for ($x = 1; $x <= $_GET['amount']; $x++) {
  14. echo '
  15. Name '.$x.' : <input type="text" class="form-control rounded-0" id="u'.$x.'_first_name" name="u'.$x.'_first_name" value="'.$_SESSION['u'.$x.'_first_name'].'"><br>
  16. ';
  17. }
  18.  
  19. echo '
  20. <input class="btn btn-primary mb-3" type="submit" name="submit" value="Next" class="button"><br>
  21. ';
  22.  
  23. ?>
Success #stdin #stdout #stderr 0.03s 26648KB
stdin
Standard input is empty
stdout
<form action="" id="formBook">
Amount : <input id="amount" name="amount" value=""><br>

<input class="btn btn-primary mb-3" type="submit" name="submit" value="Next" class="button"><br>
stderr
PHP Notice:  Undefined index: amount in /home/z7zteZ/prog.php on line 3
PHP Notice:  Undefined index: amount in /home/z7zteZ/prog.php on line 10
PHP Notice:  Undefined index: amount in /home/z7zteZ/prog.php on line 13