Jump to content
Larry Ullman's Book Forums

Check Box Validation And Its Value Display In Second Form

Recommended Posts



I have Two HTML form and one is a Check boxes form that enable users to select their category. Then I need to display second form according to the categories they selected in first form. I use this code in first form to validate form submission..


if ( isset( $_POST['category']) && sizeof( $_POST['category']) <= 3) {


$category = $_POST['category'];


} else {


$errors[] = 'Please select atleast 1, not more than 3 categories';



If errors array is empty I did this..


if ( empty( $errors )) { // If everything's OK


$_SESSION = $category;


$url = 'http://localhost/lanka_institute/tutorsignup/select_subjects.php? // Define the URL.

ob_end_clean(); // Delete the buffer.

header("Location: $url");

exit(); // Quit the script.





Can I know and is this correct? I display category list from mysql category table, it has category name and category id


this is my html part from first page


echo '<td width="50%"><input type="checkbox" name="category[]" vlaue="' . $info['category_id'] . '" />  ' . $info['category_name'] . '</td>';



any help appreciated.


Thanks in advance..

Link to comment
Share on other sites

Well: Does it work?


I would've split the next page into a seperate file, then figure out which forms to include/load there. You also need some kind of flag to prevent the user from reaching step2.php before done with step1.php.


// session_start();

// include header

// Set step in process
$_SESSION['step'] = 2;

if ( isset($_POST['categories']) && $_SESSION['step'] == 2 )
  $forms = $_POST['categories'];

  // Included wanted forms
  // If this is not allowed on server, use a switch/if-else
  foreach ( $forms as $key => $value )


// include footer


Just some thoughts. Might not be the best solution, but you could make that work. Set the $_SESSION['step'] to indicate the process or something. When step 1 is "valid", send the form to step2.php. You might need to store the checkbuttons in a session var instead of post, but bet you can work that out.

  • Upvote 1
Link to comment
Share on other sites

Thanks Antonio Conte,


But I couldn't understand exactly what have u said.


can you tell me how this code work and why??


  // Included wanted forms
  // If this is not allowed on server, use a switch/if-else
  foreach ( $forms as $key => $value )

Link to comment
Share on other sites

Its still problem.. my first form is 'sign_up.php' and second is select_subject.php'. sign_up.php page has more categories and users can select up to 3 more categories there. So. after selecting and user click the continue bottom, page want to go to second form page its select_subject.php page. In there, i want to display the categories which user selected from sign_up.php page and also its provide to select subjects according to the categories they have selected.


my problem is how can I check what are the categories user have selected and how they display in my second page.


category come to first page from my category table. It has category_id and category_name columns.


thanks for any help..

Link to comment
Share on other sites

Just check the category_id then. You probably have something like this in your html:


<form action="select_subject.php" method="post">
<p>Select bla bla_</p>
<div>This <input type="checkbox" name="category[]" value="magazine"  /></div>
<div>That <input type="checkbox" name="category[]" value="t-shirt" /></div>
<div>Other <input type="checkbox" name="category[]" value="football"  /></div>
<div><button type="submit">Submit</button>


Try placing this in select_subject.php:


echo '<pre>' , print_r($_POST['category']) , '</pre>';


As you can see, it's an array when you add the brackets to name="category[]" in the form. Without them, you will only get one value. Let's say you press each one, this would be the $_POST['category'] array:


  [0] => "magazine",
  [1] => "t-shirt",
  [2] => "football"



You can check if these values exist to add forms.


In select_subject.php:


$category_array = $_POST['category'];

// Flip value and keys for the check
$flipped= array_flip($category_array);

// Set flags for form to include
$magazine = false;
$t-shirt = false;
$football = false;

if ( array_key_exists('football', $flipped) )
   $magazine = true;
if ( array_key_exists('magazine', $flipped) )
   $t-shirt = true;
if ( array_key_exists('t-shirt', $flipped) )
   $football = true;
// Maybe you start your html here:

// <head><body>, etc....

// The normal form
<form ....>


// Then test the flags

if ( $football) {
  include("football.php"); // Or echo it, whatever.

// You do the same for the others

  • Upvote 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...